These strange large stones served as a campsite and lookout post for generations of Native Americans.

This ceremonial mound is one of the first officially recognized Native American historical sites in North Carolina.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.

This overlooked gem outside Niagara Falls preserves and celebrates Iroquois culture.

Often mistaken for an office building, inside this venue is an amazing collection of Native Alaskan art.

Gorgeous cave resemble a winter wonderland.

The king of U.S. high points towers over every other peak on the continent.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

One of the most important yet well-hidden museums dedicated to the history of medicine.

A celebration of all things tacky, garish, and bizarrely creative in the Romanian capital.

This once-derelict building is now one of the most beautiful bookstores in the world.

This massive underground salt mine now holds a sci-fi theme park in its depths.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

A hidden art gallery in an abandoned Warsaw fort.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

An underground city of salt.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A gruesome memorial for those lost in this area during the Khmer Rouge genocide.

Limestone caves in the Cambodian countryside, once the site of genocide, now a place of peaceful beauty.

5,000 skulls in memorial to those killed by the Khmer Rouge.