Richard Luke Concanen never set foot on American soil.

This three-chambered cave is the only protected natural bat hibernaculum in Quebec.

An abandoned town centered around a paper mill powered by a large waterfall.

A hidden art gallery in an abandoned Warsaw fort.

The largest catacomb system in the world.

This derelict superstructure was a very important warning system for the Soviet military.

The deepest metro station in the world.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This attraction was abandoned after the Chornobyl disaster.

The haunting complex honors the millions of Ukrainians who died in the forced famine under Soviet rule.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

A contemporary fresco movement illustrates the region's rich history.

One of Canada's oldest museums, the beautiful Redpath has been serving up Natural History and Ethnography since 1882.

This chilly Canadian hotel has a four-month lifespan due to the unusual material it's made of.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

Flashy signs from Las Vegas’s past find their final resting place at this unusual graveyard.

Canada's largest graveyard boasts a lot of noteworthy artifacts as well as its own computerized mapping service.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

This indiscriminate collection of audio antiques is trying to preserve the history of the audio industry one vintage appliance at a time.

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

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.