A neolithic tomb converted into a tiny chapel.

Rock-cut cave complex filled with ancient Buddhist artwork.

The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California."

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

Famously misunderstood wonder of the ancient world

Bring your hiking shoes, wool socks, and thermal underwear for a stay in these cozy forest huts.

This bridge is the first to be made entirely from iron, but designed like it was still made of wood.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

An 18th century wonder of the world, lost in WWII, re-created at the Catherine Palace.

A mysterious castle built as a monument to lost love.

The oldest church in Iceland is one of the few to feature ornate decoration.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A bizarre house filled with an astounding array of collections.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

The largest earthwork effigy in the world.

The ancient tomb acts as a calendar that keeps perfect time.

The meteor that sealed the fate of the dinosaurs landed at this site, one of the largest impact craters in the world.

The world's first and only natural nuclear reactor.

Native Americans built this circle of stones, which was used to predict astronomical events.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

This small town Texas cemetery is said to be the burial site of a UFO pilot who crashed in the 1800s.