While watching a video of Sweet Onion Creations making a printout of the beautiful Disney Theater in Los Angeles, it became clear that one could find ready-made 3D models of many famous buildings. Sweet Onion Creations recommends using Google Earth to find such buildings, as it's integrated with Google's 3D Warehouse.
We suspect there are many famous buildings in the 3D Warehouse. Some finds:
And remember, there are also buildings that no longer exist, like the Colossus of Rhodes, and buildings that never existed, like the Tatooine Large Building from Star Wars.
Of course, these models may not be directly printable. You'll have to inspect them for integrity, orientation, overhangs and possible even have to split them up into printable sections for later assembly.
What buildings have you printed?