Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

This fresco inside a Serbian cave church has been a source of disagreement.

One of the largest mines in Bulgaria is now home to a vast museum more than 100 feet underground.

The culture that built these Tanzanian ruins displayed advanced knowledge of irrigation technology before mysteriously disappearing.

These strange piles of magnetized volcanic ash travel across the desert about 50 feet per year.

The ruins of the "20-year town" lay out among the mountains of Alberta.

These caves are home to a small church and were used to age cheese.

This foolish Victorian sea fort was converted to a deluxe hotel.

This monument marks the beginning journey of a wounded soldier's leg that ended up almost two states away.

A remarkably well preserved tower dating all the way back to the Iron Age.

This imprint of an old computer keyboard has a unique backstory.

These medieval monastery ruins are surprisingly overlooked by most tourists.

When occupying Nazi troops detonated a mine below, medieval frescoes were revealed in this small cliff-side hermitage.

The birthplace of the very first human resident born in Antarctica.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

When King Oswald was killed in battle, an eagle dropped his arm here creating a new spring.

The remains of a small medieval chapel mark the legendary birthplace of the patron saint of Wales.

Dozens of elegant ceramic tiles decorate these ancient walls, each displaying the Lord's Prayer in a different language.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

One of the holiest Shi'i shrines in Iran honors the life and death of a learned noblewoman who became a saint.

Inhospitable caverns just beneath this island paradise offer insights into alien worlds.

Roots and stumps that lay inundated for two millennia are on display in Japan's city of three mysteries.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Despite repeated attempts to make it work, this former mining town is now nothing but dust and memories.