Death rituals and sacrifice inside a Peruvian megalith.

Huge stone depressions which may have acted as an Incan agricultural experiment.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

This black church sits alone among a field of lava rock.

Staves, storm-calling, and of course, necropants.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

This tumultuous Icelandic lava field looks so alien European researchers want to use it as a stand-in for Mars.

The oldest hall in Iceland was written of in the Sagas and features a centuries-old escape tunnel.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

Series of underground houses inhabited continuously for centuries.

Shakespeare, David Bowie, Dr. Who, the Saxons, Druids and Romans are all claimed to have all made their mark on these massive man made tunnels.

An 1814 castle that hosts an exhibit of "explorabilia".

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

The largest stone circle in the world has ended up bringing up more questions than it has answered.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Fantastically decorated underground chambers built in the 1760s.

Man-made cave with enigmatic carvings, some say made by the Knights Templar themselves.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A unique waterfall that some believe attracts the fairfolk.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.