The remains of a 19th-century school and living quarters are perched atop a mountain surrounded by a thick tropical forest.

One of the American Southwest's most extensive collections of Navajo rock art.

Sweden's oldest street has not changed for nearly a millennium.

Veryovkina Cave is more than 1.3 miles deep—the deepest known in the world.

A centuries-old copper mine that once provided two thirds of the world's copper supply.

Artillery recovered from the sea floor marks the spot of an extraordinary shipwreck.

This famous writer's tombstone is a literary pilgrimage site that was publicly defiled by a rival.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

Large Hadron Collider and the Birthplace of World Wide Web.

Caves famous for the dragon-slaying saint who lived there.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

Travelers who fall victim to this mermaid's charms are destined to stay in Užupis forever.

Ever-growing collection of devils in art.

A narrow strip of land is home to the tallest migrating dunes in Europe.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

Lithuania's outdoor sculpture trail of wooden folk art.

An abandoned Jewish sanatorium is tucked within the woods of Poland.

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

A memorial to the beloved brown bear that served in the Polish army during World War II.

Deep in a Polish forest, this collection of Iron Age megaliths still holds onto many of its ancient secrets.

The silly symbol for an underground protest group is now scattered around the city.

Museum dedicated to "the man who moved the Earth."