Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

A tribute to the truly loyal dog who waited outside a hospital for his owner to come back.

The crumbling ruins of this southern American fort have survived storms, war, and cults.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

A 1,500-year-old, 3-story subterranean city where ancient Persians took refuge in times of war.

What was once the largest mine in North America has left behind a hollow hill filled with bright blue waters.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.

This ancient theater, restored in the 20th century, lives on as a venue for dramatic and musical performances.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

Site of one of World War I's most horrific scenes.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

Great Britain's only hat-making museum.

This is the house that spite built.

Local lore says the devil built this beautiful medieval bridge to help a fleeing bandit.

Houses are tucked between, on, and underneath giant boulders.

The first spinning jail built in the United States is the only one that still turns.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

Ship-sized kinetic sculptural fantasy.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

This charming railway is one of the oldest and steepest funiculars in England.