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

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This bridge made famous in a novel and on-screen wasn't actually built over the river Kwai.

A dazzling temple featuring a towering 12-meter golden Buddha.

The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

This house is one of the most colorful in the country, and is the last remaining example of a historic villa.

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

A tunnel that brings more than a century of history to life from the deepest parts of the Niagara Gorge.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

This Niagara Falls tourist trap is a world bright with neon and curiosities that will inspire love, hate, or a mixture of both.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

On an island south of Iceland, a large volcanic rock formation resembles an elephant.

This beautiful, historic church looks like something out of a simpler past.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

Instead of solid circles, the stoplights in this northern Icelandic town have glowing red hearts.

Iceland: home to volcanoes, waterfalls and, apparently, Santa?

In Northeastern Iceland lies something of an oxymoron: a steaming desert.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

This replica Viking village was created for a film that was never shot and is now open to visitors.

This fairytale-like structure is the last turf church ever constructed in Iceland.