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

Oriental bazaar in the heart of Sarajevo.

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

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

These warring psychedelic crags commemorate an unsuccessful military operation.

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

An abandoned desert hamlet swallowed up by sand.

This Bangkok high-rise looks like a rudimentary LEGO elephant.

This huge metal monument is slowly being stripped to its concrete skeleton.

Despite being tiny and rural this Georgian airport looks like a sci-fi boondoggle.

A gleaming white and undulating tower marks the border between Georgia and Turkey.

Ruins of a former government building destroyed during the Georgian-Abkhaz war in the wake of the fall of the Soviet Union.

The cave holds a spectacular array of stalactites and stalagmites, including one shaped like a giant human heart.

The second largest in the world, this massive underground void has its own subway.

A cylinder monument with a spectacular vista commemorates a friendship that some say never existed.

The decaying remains of a once-luxurious Soviet spa town.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

Small church on top of a huge rock column.

These Stalin-era industrial 'death traps' hang lifeless above the city

Ruins of a German Castle on top of a towering stone pillar.

The ruins of an Estonian prison are drowning in the quarry lake where the convicts were once forced to work.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

This enormous abandoned prison was once dubbed the "Bastille of Romania."

This Soviet-era "closed town" was a top secret uranium producer often left off of maps.