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

This medieval manuscript collection has some of the most obscure and ancient texts in the world.

The luxurious circular mansion built for a Communist leader now lies abandoned.

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.

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

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

This series of Armenian caves held the oldest brain, shoe, and winery in the world.

Right up until the 20th century this network of man-made caves was the biggest village in Eastern Armenia.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

Complete town of 5,000 living out at sea on the world's first offshore oil platform.

Foreign invaders almost left this lovely Caucasus palace alone—almost.

What might be the largest completely Jewish town in the world outside of Israel now faces dwindling numbers and empty streets.

Azerbaijani ghost town, decaying after a war left it an armed forces buffer zone.

Spring that emits water and fire at the same time is said to have remedial properties, and sparked its own religion.

Resonant stone, that has been played since prehistoric times.

This garden is dedicated to a Portland cartoonist who specialized in dark humor.

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.

This maximum-security prison was abandoned to make way for a national park.

This unofficial museum details the rise and fall of Colombia's most notorious narcotrafficker, Pablo Escobar.

A narrow ghost town built onto a peninsula behind a Colombian Slum.

In the middle of one of South America's most historic walled cities lies a bar with an enormous collection of Soviet memorabilia.

Only gap in the 30,000-mile span of roads called the Pan-American Highway.