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.

A long-buried ancient ruin unearthed right in the middle of the city.

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

The sunlight passing through the opening of this huge cave system creates a magical effect.

Southern Italy's spinning top village.

The world's most active stratovolcano is almost always erupting.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

142 ceramic steps become a mosaic once a year.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

These 19th-century military fortifications spanning the island of Malta now form a nice countryside hiking trail.

This unique building in the main square stands out among the city's typically Baroque architecture.

Ancient mysterious ruts carved in the bedrock.

This subterranean necropolis holds three floors of antler-dug grave caves.

Ancient artists in the middle of nowhere.

Held in a fort that once stood for colonization of the area, this museum now tells the history of its indigenous people.

A rare cluster of alien-like plants grows along a dusty highway.

The remains of diamond fever taken over by the desert.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

The Gaudí-inspired building that was the start of Terrassenc modernism.

Stunning Roman aqueduct used for 1900 years and still standing.