Double spiral staircases are not unheard of, but they are very rare.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

A rare example of a German cemetery with traditional grave markers dating back several generations.

Final resting place of the humble physicist who discovered X-rays, and made the invisible visible.

The man who gave his name to magnetic measurement is buried in the city where he did his best work.

Each year, Germany's "City of Dragons" slays the world's largest walking robot.

The world's most delightful not-NOT-religion welcomes visitors to the town of Templin, just like its more stoic peers.

What was once thought to be a wellspring of unicorn bones is actually just a prehistoric burial site.

The curious underground history of keeping Paris clean.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Legends surround this jagged rock formation in the New Mexico desert.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

The remains of Crystal Palace Great Exhibition of 1851.

An intricate and amazing house built by architect Karl Junker.

Three bridges straddle a stream, one stacked upon the other.

This massive redwood tree has a hole in the base big enough to drive through.

The world's largest military aircraft cemetery.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.