This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

Among the cliffs of the Elora Gorge is an oft-overlooked piece of celebratory graffiti.

These strikingly barren, rolling red hills were caused by bad farming practices.

This extensive nuclear fallout shelter built from 42 school buses could house 500 people in its tunnels.

This scenic Icelandic lava flow is named for a pair of Berserkers who were murdered, according to a famous Saga.

Puffin enthusiasts flock to Europe's largest seabird cliff, which over one million birds call home.

Staves, storm-calling, and of course, necropants.

A trio of hidden hot tubs takes advantage of Iceland's natural geothermal vents.

Cool down and fill up after visiting Teotihuacán at this bar and restaurant in a deep, underground cave.

Twelve natural mummies are displayed in the crypt of this former monastery school.

The stoutest tree in the world.

In this beloved beach town, a secret seafood haven lies tucked behind a car wash.

This often-overlooked ocean walkway was once considered an impossible fantasy.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

These sacred Mesoamerican ruins feature peculiar petroglyphs hidden in the stones.

You can explore the halls of tombs in the abandoned former capital of the Zapotecs.

A sprawling network of century-old subterranean catacombs lies beneath a nondescript suburban home.

A mysterious pillar in an ancient burial chamber is said to predict how long you have to live.

This tiny, tucked-away eatery reflects the history of Mexico's Lebanese immigrants.

Explore the history of Mexico's lesser-known ancient alcoholic beverage.

This one-window stand has been home to a giant vat of slowly simmering meats and an array of unique tacos for almost 50 years.

A Volkswagen Beetle decorated with millions of beads connects Mexico's past and future.