These temples are among the oldest free-standing stone buildings in the world.

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

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

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

A creepy statue of a hooded ghost hauls itself up from the water in a historic Lithuanian city.

A WWII museum that tries to reenact history.

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

Launch site for nuclear war against Western Europe.

Described as one of the Baltic region’s most daring and original construction projects.

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

Lithuania's outdoor sculpture trail of wooden folk art.

The first museum dedicated to exploring humanity's cultural relationship with the celestial world.

A curious art park at the geographic center of Europe is home to 3,000 television sets and other wonders.

A small monument in Lithuania marks the geographic center of Europe—or at least one of the claimants.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The highest peak in mainland Spain is said to be the final resting place of a Muslim king.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

Only two of these trees remain in the natural world, found high in the cloud forest of the island of Mauritius.

This small group of sand dunes manages to pack in a strange rainbow of colors.

Venice's "Island of the Mad."

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.