Can you solve the mystery of Brazil’s time-traveling capital?

Forensic cartography 101: Explain what Brasilia is doing on this map of 1920s South America.

Map of the Federal District of Brasilia on a map of South America from the 1920s.

It shouldn't be there on a map this old, but there it is: Brasilia, the capital city planned and built in the 1950s.

Image: Rob Cornelissen
  • "Forensic cartography" is dating a map by the age of its borders.
  • All evidence points to this undated map of South America to be from the 1920s.
  • So why does it feature Brasilia, the new capital of Brazil, which was only built in the 1950s?

An un-German continent

An undated, early 20th-century map of South America, from the German publishers F.A. Brockhaus in Leipzig

Old, but just how old? For map nerds, undated maps like these, with lots of obsolete borders, are where the adventure is.

Image: Rob Cornelissen

Like all good adventure stories, this one starts with a map. Some time ago, Rob Cornelissen blew the dust off this one in a second-hand bookstore, and something clicked. Immediately, he knew he had to take it home. Even if the adventure the map promised was of a very different kind from the ones that happen to Indiana Jones. Instead of daredevil archaeology, think armchair cartography. In other words, the map is the adventure.

"It was a beautiful map of South America, by the looks of it from the first half of the 20th century. The reason it caught my eye, was because it was in German. The appearance of this highly un-German continent, covered with geographic names like Feuerland (Tierra del Fuego), Teufels-Insel (Devil's Island, off French Guiana) and Allerheiligen-Bai (All Saints Bay in Brazil, in Portuguese: Baía de Todos os Santos), for some reason made it very appealing to me."

Certainly adding to the appeal was the undated map's potential as an adventure in itself. Depending on the broadness of the map-reader's historical knowledge and the relative obscurity of the map itself, trying to figure out the exact date of an undated map can be a source of great frustration — and many times great satisfaction.

In the lower right, the map's provenance is indicated as F.A. Brockhaus, Leipzig. One of Germany's most prominent publishers, the company, founded in 1805, is still in operation. Since the map is taken from an atlas or encyclopedia rather than published on its own, it is not individually dated. The only way to figure out its year of origin is to examine the evidence on the map itself: Names of cities and countries, and the borders between them, as they have changed throughout history.

How to date a map

Flow chart for forensic cartography.

Guide to figuring out the age of an undated world map.

Image: XKCD

Subjecting a map to such forensic examination may never have occurred to you, but as a pastime it's popular enough to have generated this obsessive and half whimsical flow chart to help you determine the date of a world map, but also to distinguish it from breadboxes, cats and seagulls. Some more relevant determinants:

  • Is that big city on the Bosporus called Constantinople or Istanbul?
  • Are there one or two Germanys on the map? One or two Yemens? One or two Vietnams? One or two Sudans?
  • Is Bolivia landlocked or not? (we'll get back to that one later...)

While we keep waiting for the good people over at XKCD to turn this into the top-grossing board game of the Christmas season, let's return to South America.

Make yourself a cup of tea while you find your magnifying glass and settle in for a cartographic autopsy that will produce a map mystery to baffle you. If not, maybe that's because you have the answer to the question…

Post Versailles, pre Anschluss

A map of Germany after the Treaty of Versailles (1919), but before the Anschluss of Austria (1938).

The second-and-a-half Reich, between WWI and WWII.

Image: Rob Cornelissen

We ease into the job at hand thanks to the stamp-sized map of Germany in the top right corner. Placed there for the sake of size comparison, it also quickly and clearly puts outer age boundaries on the map. It can't be older than 1919, Mr. Cornelissen argues, because "the borders shown are clearly those determined by the Versailles Treaty of 1919."

Having lost the First World War, Germany was forced to cede territory to its neighbors. "The old possessions in Poland, France and Belgium are still shown behind a dotted line, as if it is hoped the loss of the territories might be a temporary condition."

The country's post-WWI borders would essentially stay the same until March of 1938, when Germany annexed Austria (the so-called Anschluss) and later that same year Sudetenland (the German-speaking border regions of Czechoslovakia). Neither of those changes is shown on the map, which with some confidence may be said to date from some time between 1919 and 1938.

The War of Thirst

Map of South America showing the borders before the Chaco War between Bolivia and Paraguay.

Oil was one of the motives of the war between Bolivia and Paraguay over possession of the Gran Chaco.

Image source: Rob Cornelissen

Dating a map within two decades on just one clue is pretty good; fortunately (for us), South America's current borders are the result of "a bucketload of minor and major border conflicts and resulting border changes, well into the 20th century," says Mr. Cornelissen.

"Take Paraguay, for instance. It is a lot smaller than it is now, indicating that the useless Chaco War (1932–35) with the Bolivians had not ended yet."

Also called The War of Thirst ("La Guerra de la Sed") because it was fought in the semi-arid Gran Chaco region, the Chaco War was the bloodiest conflict in South America in the 20th century, killing more than 100,000. Paraguay won, and obtained most of the disputed region in the peace settlement. The Chaco's presumed oil riches were one of the main drivers for the war. However, the first commercially viable reserves of oil in the region were discovered only in 2012.

The Leticia Incident

Map of border area between Peru, Brazil and Colombia before the Leticia Incident.

Image: Rob Cornelissen

"Even better, the border between Colombia and Peru is from before the conclusion of the Leticia Incident of 1932–1933."

Also called the Leticia War or the Colombia-Peru War, this nine-month, low-intensity territorial conflict claimed about 200 lives on either side, mostly from jungle diseases. Colombia sailed its navy up the Amazon to repel a Peruvian occupation of what it considered its territory. The Peruvians eventually withdrew undefeated.

Both countries reaffirmed an older treaty, which established Leticia as Colombia's southernmost city. It's not on this map, but it's right next to the Brazilian city of Tabatinga, still shown bordering only Peruvian territory on this map.

The Saltpeter War

Map of South America showing the border area beteween Peru, Bolivia and Chile.

Image source: Rob Cornelissen

"And even better still is the fact that on this map, the city of Tacna still belongs to Chile," Mr. Cornelissen enthuses. "The Chileans gained it from Peru in 1883 following the War of the Pacific but returned it to Peru with the Treaty of Lima in 1929 — making their country slightly less elongated."

Also known as the Saltpeter War, the War of the Pacific (1879–84) saw Chile defeat a Bolivian-Peruvian alliance and annex mineral-rich coastal territories from both countries, in the process land-locking Bolivia. The 1929 treaty gave Tacna back to Peru, while Chile got to keep Arica.

Despite concessions granting Bolivia access to the coast via Chile, the loss of sovereignty over its coastal area has left a deep and lasting scar on the Bolivian psyche.

Time-travel paradox

Map of South America showing part of Brazil, its Federal District and the capital, Brazil.

City out of time? A map of 1920s South America, showing Brazil's new capital Brasilia, which was built only from 1956.

Image source: Rob Cornelissen

So, the return of Tacna narrows down the time frame for this map to the decade from 1919 to 1929. A nice piece of map sleuthing so far, but nothing out of the ordinary. Until you focus on the Brazilian state of "Goyaz" (an older spelling; current name is "Goias"). It is perforated by a rectangular zone, labelled Bundesdistrikt ('Federal District'). Contained within it is a fairly large city, called Brasilia.

Yes of course, you might think: that's the correct location and name of the capital of Brazil. But, as Mr. Cornelissen accurately points out: "That city was only founded in… 1956!"

From 1763 until 1960, Brazil's capital was Rio de Janeiro, a coastal metropolis. Being a port city was beneficial for trade, but it also meant that Rio was far away from the country's huge interior. From as early as the mid-19th century, the idea arose to build a new capital, at a more central location inland. But those plans only came to fruition in the mid-20th century.

Fulfilling a campaign promise, president Juscelino Kubitschek – known colloquially as 'JK' – ordered a contest for the design of Brasilia in 1956. Construction started the same year and was completed in a mere 41 months. Brasilia was declared the nation's new capital in 1960.

"In the 1920s, Brasilia certainly wasn't "under construction" for Brockhaus to already put it on their maps — and certainly not as a major city, marked with a dot as big as Rio, Sao Paulo or Buenos Aires!" At that time, JK's push to finally find the exact spot and the right design for Brasilia was still decades in the future.

"So… What is going on with this map? What am I missing? Either the location and name of Brasilia was known a lot earlier than is common knowledge these days, or" — Mr. Cornelissen suggests, "there is some weirder cause."

Although the idea of a planned capital is much older than Brasilia, this map suggests that its exact location — and that of its Federal District — were already established decades ahead of its actual construction. In which case the dot on this map would have marked not a city, but forests or fields.

Alternatively, Brasilia is a city with magical qualities, and it can travel through time. Or is there another explanation? To quote Arthur Conan Doyle, by way of Sherlock Holmes: "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."

If you can solve the mystery, let me know at Plausible and/or interesting theories will be published below!

Strange Maps #989

Map of South America kindly provided by Mr. Cornelissen. Flow chart for figuring out the age of an undated map found here on XKCD.

Got a strange map? Let me know at

This is what aliens would 'hear' if they flew by Earth

A Mercury-bound spacecraft's noisy flyby of our home planet.

Image source: sdecoret on Shutterstock/ESA/Big Think
Surprising Science
  • There is no sound in space, but if there was, this is what it might sound like passing by Earth.
  • A spacecraft bound for Mercury recorded data while swinging around our planet, and that data was converted into sound.
  • Yes, in space no one can hear you scream, but this is still some chill stuff.

First off, let's be clear what we mean by "hear" here. (Here, here!)

Sound, as we know it, requires air. What our ears capture is actually oscillating waves of fluctuating air pressure. Cilia, fibers in our ears, respond to these fluctuations by firing off corresponding clusters of tones at different pitches to our brains. This is what we perceive as sound.

All of which is to say, sound requires air, and space is notoriously void of that. So, in terms of human-perceivable sound, it's silent out there. Nonetheless, there can be cyclical events in space — such as oscillating values in streams of captured data — that can be mapped to pitches, and thus made audible.


Image source: European Space Agency

The European Space Agency's BepiColombo spacecraft took off from Kourou, French Guyana on October 20, 2019, on its way to Mercury. To reduce its speed for the proper trajectory to Mercury, BepiColombo executed a "gravity-assist flyby," slinging itself around the Earth before leaving home. Over the course of its 34-minute flyby, its two data recorders captured five data sets that Italy's National Institute for Astrophysics (INAF) enhanced and converted into sound waves.

Into and out of Earth's shadow

In April, BepiColombo began its closest approach to Earth, ranging from 256,393 kilometers (159,315 miles) to 129,488 kilometers (80,460 miles) away. The audio above starts as BepiColombo begins to sneak into the Earth's shadow facing away from the sun.

The data was captured by BepiColombo's Italian Spring Accelerometer (ISA) instrument. Says Carmelo Magnafico of the ISA team, "When the spacecraft enters the shadow and the force of the Sun disappears, we can hear a slight vibration. The solar panels, previously flexed by the Sun, then find a new balance. Upon exiting the shadow, we can hear the effect again."

In addition to making for some cool sounds, the phenomenon allowed the ISA team to confirm just how sensitive their instrument is. "This is an extraordinary situation," says Carmelo. "Since we started the cruise, we have only been in direct sunshine, so we did not have the possibility to check effectively whether our instrument is measuring the variations of the force of the sunlight."

When the craft arrives at Mercury, the ISA will be tasked with studying the planets gravity.

Magentosphere melody

The second clip is derived from data captured by BepiColombo's MPO-MAG magnetometer, AKA MERMAG, as the craft traveled through Earth's magnetosphere, the area surrounding the planet that's determined by the its magnetic field.

BepiColombo eventually entered the hellish mangentosheath, the region battered by cosmic plasma from the sun before the craft passed into the relatively peaceful magentopause that marks the transition between the magnetosphere and Earth's own magnetic field.

MERMAG will map Mercury's magnetosphere, as well as the magnetic state of the planet's interior. As a secondary objective, it will assess the interaction of the solar wind, Mercury's magnetic field, and the planet, analyzing the dynamics of the magnetosphere and its interaction with Mercury.

Recording session over, BepiColombo is now slipping through space silently with its arrival at Mercury planned for 2025.

Photo by Martin Adams on Unsplash
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