This video from the Netherlands says about itself (translated):
September 11 2015
Swarming ants in an anthill and busy city life are often compared. But in Rotterdam they made a very special example of that. Designer Lucas Zoutendijk of Bureau 1:1 made for the Architecture Day an ant city of sand in the shape of the map of Rotterdam. 1300 ants have been living there since some weeks ago. The Spanish ants immediately began construction of their ideal city.