The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A daily replay of the experiment that proved the rotation of the Earth.

This elaborate towering structure was once famed for its revolutionary height.

Yo, Adrian!

Dr Barnes' $25 billion private collection of art and arboretum.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

Former hunting lodge of a duke who was an avid collector of impressionist works.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

The curious underground history of keeping Paris clean.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Wild West history in Hollywood style.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

This star-studded Old Hollywood restaurant is where fettuccine Alfredo made its United States debut.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

The legendary building that needed ghostly approval before being built.