Headquarters of the Main Intelligence Directorate

The Headquarters of the Main Intelligence Directorate, commonly known as the Aquarium, is the headquarters of the Main Directorate of the General Staff of the Armed Forces of the Russian Federation, and is located at Khodynka Field, the site of Moscow's first airport.
The building was extensively renovated in the early 2000s.

Name

The site's colloquial name of the 'Aquarium' is supposedly a wordplay on the GRU's ability to see what is happening in the world from inside the building, and was first introduced into popular usage by GRU defector Viktor Suvorov's 1985 semi-autobiographical book on the workings of the GRU, Aquarium.