Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

Historic medieval fortified city in southwest France.

This ancient tunnel is one of the most important examples of Roman hydraulic engineering in Spain.

An unexpected ghost village lurks on the southeast coast of Tenerife.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

The ruins of a bombed medieval village memorialize the destruction of the Spanish Civil War.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

Stunning Roman aqueduct used for 1900 years and still standing.

After the band included its number in one of their songs, the box became a monument to the musical group.

A hundred copies of Antony Gormley's naked body stare out across the water.

19th century tunnels burrowed under Liverpool.

This aging storage facility is the world's largest brick warehouse.

Charles Dickens described the concert room in this amazing Victorian hall as "the most perfect room in the world."

Pyramid shaped monument with a tall tale attached.

The tower was originally used as a chimney for the waste incinerator of St. John's Precinct and Market.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

After mysteriously refusing to surrender at the end of World War II this sunken submarine was only salvaged in a search for Nazi gold.