- By 1940 the Radio City, which became known as the Rockefeller Center, consisted of 14 buildings, located around a central sunken plaza, the Lower Plaza, best known for its very popular skating rink. Another important building in the Rockefeller Center is the Radio City Music Hall. When built, it was the largest indoor theater in the world with a seating capacity of around 6,000. Guided tours give you the opportunity to catch a glimpse of the spectacular art deco interior. Be sure to check for tour rates and ours of operation.