Tunnels show Hitler's megalomaniac vision

Three vast tunnels were opened under central Berlin this month, giving a glimpse of Adolf Hitler's megalomaniac vision of a new architectural center for the capital of Nazi Germany.

The 16-m deep tunnels were constructed in 1938 as part of an underground transport network beneath a series of bombastic buildings designed by Nazi architect Albert Speer, including the biggest domed hall the world had ever seen.

The overground plans, never completed because of World War II, included boulevards, squares and huge buildings, such as an arch dwarfing the Arc de Triomphe in Paris, and the 290-meter high Great Hall, with room for 180,000 people.