Nazi Megastructures

Hitler's alpine retreat in Bavaria is fortified with 2,000 SS troops and protected by a high-level security system.

Hitler orders some of the most fortified structures in the Third Reich on the Channel Islands.

In the first two years of World War II, Hitler's fighting machine crushes Germany's enemies in a series of offenses called the blitzkrieg or lightning war.

The Type 21, Hitler's sea-faring super weapon, was the world's most advanced submarine.

The Japanese design the Yamato, the world's most powerful battleship.

Japanese generals construct a network of defenses and tunnels on Okinawa, creating a devastating killing ground for American troops.