This stunning gothic ruin was a casualty of the Indiana steel industry crash.

Romania's triumphal arch looks out over Bucharest.

An impactful museum ensures notorious war crimes disguised as "medical experimentation" won't soon be forgotten.

North Korea's massive "hotel of doom."

A bizarre collection of gifts to North Korean dictator Kim Jong Il from the despots of the world.

This tiny patch of arid sand sits in one of the greenest states in the United States.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

At 207 feet, one of the world's longest continuous escalators.

Home to items never before seen by the public.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

This "second" cemetery represents New Orleans' attempt to keep cholera at bay.

The final resting place of New Orleans' most famous voodoo priestess.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

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

A world-class observatory in the California desert.

Built in 1869, this now-retired structure looks more like a medieval fortress than a county lock-up.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

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

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

340-foot statue built to honour the Heroes of the Soviet Union.

Monument to a suicide protesting the Soviet invasion.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.