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

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

A geological oddity topped with a 2,000-year-old pagan temple.

Nestled in a peaceful valley, this Armenian monastery may have been saved from Mongols thanks to the eyes of God.

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

Also known as the Great Mosque of Damascus, this is one of the world's largest and oldest mosques.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

Ancient serpentine sacrifice holder that has stood the test of time.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A fountain standing as a testament to a doomed alliance.

A marvel of Byzantine engineering under the streets of Istanbul.

One of the most photographed locations in the entire city.

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

This one-time health resort was used by aristocrats around the world.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

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

Roman ruins top white travertine terraces formed by ancient hot springs.

This famous city eluded concrete detection until the early 2000's.

One of the most spectacular canyons in the world.

This massive underground salt mine now holds a sci-fi theme park in its depths.

A countryside Romanian cemetery filled with colorful crosses bearing lyrical, ironic, or satirical rhymes.

The world's second-largest sundial, made entirely out of stone.