The remnants of an early American attempt at missile defense.

Rusting ships sit in a desert where a sea used to be.

Explore 10 acres of environmental sculptures.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Rippling sand dunes frozen in the Arizona rock.

Ride the subways of yesteryear.

This "floating island" plateau sits 7,671 feet above the forest floor.

The tallest bronze seated statue of the Buddha in Japan.

Futuristic apartment blocks are the backdrop for Montreal surfers hangin' ten on the Habitat '67 standing wave.

Hundreds of hidden passageways weave through the old quarters of Lyon.

Where giant ships go to die.

Concrete strongholds stand guard over the Golden Gate.

Site of a former hidden treehouse in New Orleans.

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

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This small chapel is built of human bones and decorated with a golden skeleton.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

The original "capsule building" is a masterpiece of Metabolist architecture.

A sacred lake with thousands of sacred carp and a biblical history.

The world's largest vertical wind tunnel.

A heavenly experience, right here on Terra Firma.