Eons ago, a rushing lava river formed this pristine passage through solid rock.

Stalactites and stalagmites in a beautifully lit cave.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

This dramatic rail curve was once the target of a failed Nazi attack.

The mortal remains of a Russian prince, priest and paranormal investigator who came to America in 1792.

Swarovski's museum/theme park is a fake diamond fantasia overlooked by a giant.

Macabre museum devoted to historical Viennese murders.

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

A glacier pocked with ice caves and surrounded by rainforests.

A perfect turquoise lake colored with glacier dust.

The glacier tucked within a New Zealand rainforest.

Edoras, capital city of Rohan in Lord of the Rings, once sat atop this isolated New Zealand mountain.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

Museum about life, death, and cannibalism in the Stone Age.

England's most notorious suicide spot.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

Pop culture has helped to keep this iconic British building from being destroyed.

Underneath a chalk hill in France lies what Hitler hoped would be the underground launching base for a devastating new weapon.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Longest canal tunnel in the world, abandoned in the 1960s.

Known for the tunnel that leads visitors to the water.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

Chewing gum tycoon's memorial lies perched over wife's botanical gardens on Santa Catalina Island.

A herd of 150 bison live on California's Santa Catalina Island and are at the heart of an ongoing debate between environmental protection and economic expansion.