An Italian hillside ghost town.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

The oldest-known example of a historic architectural style recognized by UNESCO.

An impressive bridge over a ravine also served as an aqueduct.

Geometry and mystery come together in an epic show of octagonal masonry.

A dead saint, a deadly poison, and a mysterious holy ooze.

Inside this Icelandic greenhouse, geothermal energy keeps tomatoes warm and growing.

A relatively obscure antihero from the Marvel Comics universe adorns a wall inside Iceland's main airport.

The final resting place of the controversial chess champion.

Along this wire fence, travelers have been leaving a particular memento since 2012.

A Wes Anderson-esque lighthouse that boasts magnificent coastal views.

This beautiful, historic church looks like something out of a simpler past.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

A lonely beacon, precariously perched atop a remote sliver of rock.

Three columns of volcanic rock shoot out of the ocean.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

A winding, blood-red tunnel of hardened lava navigable by foot.

Walk in the footsteps of the gods and straddle two tectonic plates.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

Learn about Iceland's hidden folk at this school dedicated to the study of elves.

An encyclopedic collection of mammal penises.