The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

Crumbling World War II-era gun emplacements still stand near lighthouses on the Spanish coast.

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

Lava stone structures possibly dating back to the 19th century may have been a stopping point for voyagers between ancient Egypt and the Mayan Civilization.

This beautifully verdant lagoon is tucked below a massive volcano in a crater atop a black pebble beach.

A large collection of solar and night-time telescopes dot a small area on the Teide mountain range.

This enormous censer uses a pulley system installed over 400 years ago.

This magnificent brick dome was made with an unusual design method.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

A small church ornamented with medieval erotic sculptures.

Salaguti's live-in museum: a fortress against criticism and consumer art.

Giant granite sculptures representing family on the northern coast of Spain.

An old Danish political institution where members of government can grab a drink off the record.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

A collection of noses tucked inside an art museum reveals how times have changed.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.