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.

A strip of neutral ground where the people of Tajikistan and Afghanistan come together to trade.

Surreal riveted sea forts once protected the Kent shores from German attack.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Famously misunderstood wonder of the ancient world

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

These fantastically named natural pools look like something out of a Scottish myth.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.