One of only two commuter aerial tramways in the United States.

This historic Victorian hotel has a scandalous history of affairs and murder.

This natural wonder is disappearing at an alarming rate.

Fossils, railroads, and waterfalls!

In 1909, the steepest and most difficult piece of track on the Canadian Pacific Railway was replaced with a series of spiralling tunnels cut into the mountains.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

A historic Montreal market that was the city's agricultural hub for over century.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Both church and state get put to the torch in this annual festival in the "Bonfire Capital of the World."

Old Tudor home moved on thick iron rails to a new spot.

At just 25 inches at its narrowest point, it's one of the tightest streets in the world.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Disused seaplane hangar gets a second life as the jaw-dropping home of Estonia's museum of maritime history.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

It houses the remains of a 17th-century version of the Titanic.

Old Danish castle immortalized in Shakespeare's Hamlet.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

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

This futuristic German television spire is actually the world's largest digital clock.