The ruins of an abandoned crematorium haunt an eerie deserted German cemetery.

The small alleys in Lübeck's Old Town are a result of medieval urban sprawl.

The bells remain in a shattered heap exactly as they fell when the church was bombed in World War II.

A statue honors the local legend that the devil helped build St. Mary's church after being tricked into thinking it was going to be a wine bar.

Dancing skeletal figures pay homage to a medieval mural destroyed during World War II.

A stunning two-story timepiece within a medieval Brick Gothic church.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

A village on the east coast of England that has almost completely eroded into the North Sea.

Abandoned Air Force base that has fallen into disrepair.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

A painfully obvious spy house sits right across the street from the Russian Embassy.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

A 19th-century British industrialist built this Louis XIII–inspired chateau for his homesick French wife.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

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

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

Europe's second largest ossuary wasn't discovered until 2001.

Of all the houses that grace this neighborhood, only one is a testament to surreal architecture.

This natural wonder is disappearing at an alarming rate.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.