20th-century architecture

Buildings by century: • 1st millennium 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 • 2nd millennium 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 • 3rd millennium 21

Note: Before uploading a 20th or 21st century artwork you should verify that:

its author has been dead for at least 70 years;
otherwise, if it is permanently installed in a public place, that freedom of panorama applies; or
otherwise, that a permission be granted by the author or by his heirs/estate to publish it on Wikia.