Home to three historic ships from the age of Vikings.

The Dalai Lama named this New Zealand landscape the "Spiritual Center of the Universe."

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

Small monoliths of several varieties of stone sit alongside a wooded path in the Bronx.

A perfectly running 230-year-old silver automaton and music box.

A neo-Gothic castle in the Argentinian countryside.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

Former abode of notable poet, complete with literary references and stories of ghosts.

This dilapidated castle-like structure overlooks the Hudson River at one of its widest points and was once home to nuns.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

Rippling sand dunes frozen in the Arizona rock.

A clear example of the process of erosion in action.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

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

1513 Turkish world map, full of European state secrets and snarky commentary.

A marvel of Byzantine engineering under the streets of Istanbul.

Limestone grottoes turns everyday objects into stone.

Now a pile of ruins and rubble, this was a lovely mountain town as recently as 1960.

The largest underground church in Europe.

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

An abandoned castle owned and ignored by Masons carries a cursed history.

Little island known for its massive beachfront "flowerpot" pillars.