A forgotten remnant of the Soviet Union, Transnistria is an unrecognized country hidden behind a heavily militarized border between Moldova and Ukraine.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This sign marks the entrance to a tiny proto-state within the small country of Moldova.

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

Ancient serpentine sacrifice holder that has stood the test of time.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

A marvel of Byzantine engineering under the streets of Istanbul.

A huge Soviet-era robotics factory in the outskirts of Pripyat, now long-abandoned.

This derelict superstructure was a very important warning system for the Soviet military.

This attraction was abandoned after the Chernobyl disaster.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

The dining hall that nourishes workers in Chernobyl's Exclusion Zone is also open to visitors.

The biblical sculpture honors those who lost their lives, homes and communities to the Chernobyl disaster.

The home where a lovestruck Fitzgerald wrote his first published novel, "This Side of Paradise."

The basement bowling alley of this St. Paul dive bar is decorated with thousands of dollar bills.