I can agree that the Great Pyramids, or the Parthenon, the Coliseum, the Acropolis and other magnificent ancient edifices are worthy of preservation, and were originally intended to survive for centuries...but why so many old wooden, or brick-and-mortar structures, like birthplaces of dead or living Presidents, old libraries, theaters, churches, town halls, etc, etc? This sort of quaint nostalgia serves no real civic purpose, and leaves succeeding generations a debt burden of maintenance on real estate that could be better put to meet current or future needs.