This metal tower in the desert provides views of a handful of Nazca geoglyphs.

One of Oxford's greatest treasures likely belonged to the legendary King Alfred the Great.

Some claim these desert ruins are from the legendary "Atlantis of the Sands."

These gnarly desert trees produce the prized aromatic resin traded along the ancient incense trail.

Legend says this rock was once a chopping block for public executions.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

A clerical error gave rise to this imaginary micronation in the southwestern corner of Estonia.

Along the most northwestern point in Africa is an ancient cave surrounded by legends.

William Smith's iconic "map that changed the world" is hidden behind a curtain in the Geological Society building.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

Bad farming practices caused this unnatural natural wonder.

The ruins of this antebellum sugar plantation are the end result of a Seminole attack during the Florida Wars of 1836.

The ruins of a once-thriving sugarcane plantation that was burned in the Second Seminole War.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

The only ancient owl carving found east of the Mississippi.

One of the world’s largest and deepest freshwater springs, where mastodons once roamed.

An abandoned network of military bunkers and tunnels open for anyone willing to descend into the darkness.

The only Florida state park with publicly accessible caves.

The mysterious 855-foot zigzagging stone wall has been baffling people for centuries.

Spend the night in this formerly abandoned traditional Scottish village.

The Neolithic megalith was one of the first archaeological ruins protected by the British government.

Cornish legend says these ancient circles were people turned to stone for playing hurling on a Sunday.

These magnificent city walls rise from the barren sun-baked Spanish plains like something straight out of a fairytale.

A holy well supposedly infused with a saint's spirit flows within this quaint chapel.