A museum dedicated to exhibiting remarkable outsider art.

A bas relief commemorates the "Nuns of the Battlefield" who cared for soldiers on both sides of the conflict.

The hidden ruins of a mill that is linked to an attempt to assassinate the vice president of the United States.

FDR's Art Deco hospital tower was hopelessly inefficient.

A painfully obvious spy house sits right across the street from the Russian Embassy.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

This grand gothic brewery has been pumping out suds for over a hundred years.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

What happens when you cross a mayor and a painter?

Bronzes and busts that once stood in the city's main squares are now relegated to a small hidden courtyard.

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

Liechtenstein's royal family calls this medieval alpine castle home.

In one of the smallest countries in the world stands an original Salvador Dalí sculpture.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Founded as a refugee camp, now a popular tourist spot.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

An eerie collection of the surviving structures from a past celebration of the future.

The world's largest wooden structure.

Spain's largest bullring offers a unique glimpse at architecture and history.

The final resting place of the great navigator, or maybe his brother.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.