These "50 Fortresses" have been unearthed in the ancient oasis of Khwarezm.

Final palace complex of the last of 29 Kokand rulers.

The Avenue of Mausolea is a series of grand palatial tombs.

Light still pours into the ruins of this ancient Islamic observatory.

Ancient barriers wrap around what was once an important stop along the Silk Road.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

A peculiar museum that includes many drunken tales, a drunk driving simulator, and much more.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

Where the lovelorn find a home for their sentimental keepsakes.

The most visited, and possibly most controversial, museum in Germany.

A small monument on the outskirts of Prague, where one of the bloodiest conflicts in the country's history was decided.

Huge stairway leads to this massive gallery.

The ruins of a medieval monastery built on a perilous slope.

This little medieval church hidden in the center of Yerevan was lost and rediscovered—twice.

This ancient monastery complex was transformed from an island to a peninsula when the lake was partially drained.

The world's longest nonstop reversible cable car soars through spectacular scenery to the medieval Tatev Monastery.

Centuries before the modern seismograph, Armenian monks measured quakes with this tilting pillar.

She asked for a potato cellar and over the next 23 years he gave her a network of holy caves.

After visiting hours, this picturesque waterfall is essentially turned "off" to be used for hydroelectric power.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

One of 200 religious buildings recognized as a “culture monument.” 

Bronzes and busts that once stood in the city's main squares are now relegated to a small hidden courtyard.

This beautifully preserved Ottoman house is steeped in history.

Climb into Albania's communist history while enjoying a spectacular ocean view.