5. Takasugi-an, Japan

Located in Nagano, Japan, Takasugi-an (“a teahouse built too high” in Japanese) was designed by architect Terunobu Fujimori for his use. It is supported by two thin chestnut trees and can only be accessed via a free-standing ladder. One can relax on the bamboo mat inside the structure and enjoy the breathtaking views down the hill.
6. WoZoCo Apartments, Holland

Boasting a bold but attractive aesthetic design, WoZoCo Apartments in Amsterdam have been home to private residents for over 5 decades. But a fun fact: the building wasn’t originally constructed like this. The extra units protruding from the main structure were added simply to avoid occupying more land.