There's something special about islands - in some cases, it's the price tag
Most of it was eaten by Earth's mantle, but scraped-off bits survive in the Alps and other mountain ranges.
- Following a 10-year survey, geologists discover a lost continent in the Mediterranean.
- 'Greater Adria' existed for 100 million years, and was probably "great for scuba diving".
- Most of it has been swallowed up by Earth's mantle, but bits of it survive.
A review of the global "wall" that divides rich from poor.
- Trump's border wall is only one puzzle piece of a global picture.
- Similar anxieties are raising similar border defenses elsewhere.
- This map shows how, as a result, "the West" is in fact one large gated community.
The summit of Europe's most active volcano is also the world's only decipoint.
There are good historical reasons why Germans are suspicious of surveillance — but is Google as bad as Gestapo or Stasi?
- Since its launch in 2007, Google Street View has mapped millions of miles of roads across the world – and even gone to space and into the ocean
- Germany and Austria are a conspicuous gap in the mess of blue lines that covers the rest of Europe
- It's to do with Germans' curious sense of privacy: they'd rather flaunt their private parts than their personal data