This sprawling stronghold has been at the center of some of South India's bloodiest wars.

This fortress played a key role in the battle that would ultimately give rise to the Maratha Empire.

The ancient water tanks remain some of the ruined city’s most beautiful architecture.

A centuries-old lookout post still sits atop a natural stone spire.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.