Documenta

Documenta (often stylized documenta) is an exhibition of contemporary art which takes place every five years in Kassel, Germany.
Documenta was founded by artist, teacher and curator Arnold Bode in 1955 as part of the Bundesgartenschau (Federal Horticultural Show) which took place in Kassel at that time. It was an attempt to bring Germany up to speed with modern art, both banishing and repressing the cultural darkness of Nazism. This first Documenta featured many artists who are generally considered to have had a significant influence on modern art (such as Picasso and Kandinsky). The more recent editions of the event feature artists based across the world, but much of the art is site-specific.
Every Documenta is limited to 100 days of exhibition, which is why it is often referred to as the "museum of 100 days". Documenta is not a selling exhibition.