Urban Forest in Chongqing, China, 385 m (project).
Palm Jebel Ali, just off the coast of Dubai designed by Royal Haskoning.
The Hundertwasser tower, designed by Austrian Friedensreich Hundertwasser, was built in Abensberg, south Germany, 10 years after his death. The tower is 35 meters high and 6 meters is diameter, twice smaller than the original project of the architect. A wonderful view of the town opens from the upper site of the tower, which has no straight lines.
Strange home in Germany
The Spaceship House, a weird house in Chattanooga (TN, USA). I've seen this one several times.