Vienna

A complex of buildings has been built in Vienna, which is one of the four main places in the world (along with complexes in New York, Geneva, and Nairobi) where United Nations institutions are located - Vienna Internationale Center.

An excerpt from the article 48 facts about Vienna

The Complex consists of 6 office buildings of similar architectural form, built on a Y-shaped plan. The tallest of the edifices measures 120 meters high and has 28 floors. The center is a workplace for some 5000 people. The VIC has its own subway station and a small church. The Austria Center Vienna conference center is also located in close proximity.