Ancient serpentine sacrifice holder that has stood the test of time.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

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

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

This rare wildlife haven in Singapore feels like you're in the tropical rainforest.

A historical convent known for taking in bad luck babies left on its doorstep is now an upscale shopping center.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A bisected journey through evolution's history in the heart of Beijing.

The most famous location in China was home to whole dynasties worth of imperial rulers.

A Nesting Doll of Churches.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

Singapore's landscaping project is home to 18 incredible Supertrees.

This $62 million dollar temple was erected to house one little dental fragment of religious history.

The most playful of the life-sized statues that make up Singapore's "People of the River."

Scholar, adventurer, saint, and instigator of the Goa Inquisition.

Three bridges straddle a stream, one stacked upon the other.

The largest known medieval map of the world.

Rare collection of medieval books under lock and key.

This Scottish museum is the only one in the world to focus not on one religion but all of them.

Eighty million natural history specimens call this gargantuan museum home.

The anatomical-pathological collection of a man who changed surgery.

London's smallest police station is barely the size of a phone booth.