"Designed by architecture firm Blue Forest, the Eco-Perch is a luxury tree house built from natural materials that can be constructed in 5 days with minimal impact to the environment. The small dwelling can accommodate four people and includes a combined kitchen, dining, living area and bedroom." Could be cool as a vacation home somewhere
Located in Darmstadt, Germany, the Waldspirale apartment building was designed by Austrian artist, Friedensreich Hundertwasser, and built during the 1990s. The U-shaped Waldspirale's diagonal roof is covered with grass, shrubs and trees, and the facade follows an irregular grid organization. Waldspirale has over 1,000 windows, but no two are the same. The handles on the apartment doors are also unique.