The Guardian of Tallinn.

The oldest church in the Estonian capital is home to over 100 fantastical cemetery coats-of-arms.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

This small hilltop church weaves the urban history of Washington, D.C. with the national history of the United States.

The privately owned cemetery that holds room for Washington's finest when they step down from life.

An overlooked oasis of quiet on the grounds of Washington's monumental basilica.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

A haunting tribute to pioneering photographer Clover Adams.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

People escaping slavery may have hidden inside a corpse vault.

The site of the climactic scene from the classic horror film is now a historic landmark.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Ride the subways of yesteryear.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Try not to get slimed in Tribeca.

The corporeal remains of Napoleon III's dentist rest under this 15-story obelisk.

This little-known Revolutionary War fort is supposedly haunted by the ghosts of its past.

Yo, Adrian!

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

Where America's first doomsday cult awaited the end of the world.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.