America's only nuclear missile silo open to the public.

A reproduction of earth's many biomes.

Controversial site of what could be Europe's first pyramid.

Oriental bazaar in the heart of Sarajevo.

A forgotten and crumbling Yugoslav monument to the victims of fascism.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

This museum preserves the hand-dug tunnel that kept Sarajevo afloat during the Serbian siege.

A war-torn Olympic relic is being overtaken by graffiti and nature.

These warring psychedelic crags commemorate an unsuccessful military operation.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

Yugoslavia's biggest underground airport lies in ruins.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

A pair of connected skyscrapers form this symbolic gateway.

A hidden subterranean installation offers a view of the sky.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A huge musical instrument played by the ocean.

An abandoned factory along the Mississippi coated by a giant mural.

Man-made geyser that rises to the exact height of the Gateway Arch.

The first rural cemetery west of the Mississippi is home to the elaborate tombs of St. Louis' local beer barons.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.