The Hundertwasser House is one of Vienna’s most visited buildings, built after the idea and concept of Austrian artist Friedensreich Hundertwasser (1985). Undulating floors, a roof covered with earth and grass, and large trees growing from inside the rooms, with limbs extending from windows. 52 apartments, 4 offices, 16 private terraces and three communal terraces, and a total of 250 trees and bushes.