Military

One of the largest amphitheaters in Europe is a former Nazi German gathering place that still stands today.

The graffiti-covered remnants of a former triangulation station are balanced precariously on this California peak.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

Only a handful of these gorgeous historic waterwheels remain but even those are in danger from local unrest.

This lovely little pond is named after the hundreds of soldiers' corpses that were rolled into the waters during the French-Indian War.

Pirates had to be ousted from the land where this now ruined Louisiana fortress was built.

This tiny Hawaiian island is slowly coming back to life after being bombed during naval training exercises.

These warring psychedelic crags commemorate an unsuccessful military operation.

The yawning remains of a complex naval fortress still haunt this Australian shore.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

This former Cyprus flight hub is now a crumbling, abandoned ghost complex.

The remains of one of America's first radiation testing grounds still rest ominously in a Georgia forest.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.