A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Mountain where Jesus was first tempted by the Devil.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

After serving in Vietnam, Korea, and even a stint in the Turkish navy, the unique ship is now open as a museum.

A haunting, yet lovingly hand-hewn potters' field full of graves that flood with each heavy rain.

This abandoned Civil War fortress is slowly being swallowed by the waters of Lake Borgne.

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

This bar named after the world's first mixed cocktail was home to one of New Orleans' most notorious politicians.

Made of giant chains and hung with shackles, this iron cross honors those unknowns who perished under American slavery.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

In Edwin Hubble's hometown, a scale model of the groundbreaking telescope that was named in his honor.

This 1854 courthouse along the Mississippi River has a storied history.

A subterranean haunt where wine and homemade biscottis are always on the menu.

The show pony of cave systems, Fantastic Caverns manages to live up to its name.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

The world's largest man-made underground caverns offer unparalleled underwater wonders.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

The lowest point in the state of Illinois, at the confluence of the Mississippi and Ohio rivers.

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

This national park dedicated to the tallgrass prairie ecosystem still displays its military past.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

The legacy of an unsolved, gruesome murder rests beneath the spans of this historic bridge.