The site of an early Arthurian battle and the dwelling-place of prehistoric people and (possibly) an ancient race of giants.

Several 12th-century ruins can be found inside this historical market.

A Buddhist theme park brings you a Buddhist version of Hell.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

The mystery of the Putim Ossuary involves a tricorn hat.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

Popular river that runs through the remote Serbian municipality of Leskovac.

An 11th-century Byzantine church with medieval Serbian history and spectacular views.

Structure built from the skulls of vanquished foes.

A ghostly mansion in the middle of downtown Tunis.

Rare recess caves fill this unbelievably beautiful Ohio park.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

This small museum inside a larger sports complex honors the first Native American to win an Olympic gold medal for the U.S., and his life of achievement and struggle.

Little did a museum know, they possessed the last-known lunch wagon in existence.

The only surviving prototype for Buckminster Fuller's house of the future.

The property contains 37 preserved animal effigy mounds constructed by Native Americans between 800-1100.

People of the Plum Bayou culture built these enormous mounds over 1,000 years ago.

The site of an ancient Mississippian settlement that appears to have flourished during the 10th to 13th centuries.

This limestone outcropping was once a ceremonial site for ancient Native Americans.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Myanmar's beautiful cemetery for Allied soldiers who perished during World War II.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

Once an ancient Roman bath, now a hotbed of geothermal energy and a hub for energetic innovations.