This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

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

The celebrated eyesore created by starry-eyed sweethearts.

The final resting place of the "father of special effects."

Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

France's most famous cemetery, with some of its most curious tombs.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

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

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

A haunting collection of the vanished and disappearing natural world.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

This museum houses an imposing skeleton army comprised of creatures great and small.

Developed by focused shutterbugs, this museum exposes visitors to more than 6,000 different cameras.

A former mental hospital founded in the 1930s by a eugenicist who advocated for the forced sterilization of patients.

The monument's pointy aluminum tip has been melted down by repeated lightning strikes.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

An astounding collection of medical specimens, including bits of President Lincoln.

Hundreds of 19th-century characters descend upon an Ohio town every autumn.

Color-coded signs direct drivers on a network of routes designed to avoid Pittsburgh traffic.

A monument to the “unrecognized dead” of the tragic 1876 train crash.

Solving a 60-year mystery finally gave a name to the young woman known only by the color of her clothes.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

Romania's triumphal arch looks out over Bucharest.