A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

A 19th century library favored by Edgar Allan Poe and H.P. Lovecraft, known by locals as "the Ath."

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

Holding the most bodies of any cemetery in the United States.

Cryptic messages embedded in the New York City sidewalk.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

Last residence of H.P. Lovecraft featured in his story "The Haunter of the Dark."

The vaguely man-shaped root that ate the body of the founder of Rhode Island.

A former major munitions plant that has been converted into a sprawling art space.

Headquarters of the legendary clairvoyant's readings, spiritual hospital, and massage school.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

Haunting and beautiful trees, doomed to die.

A building so large that it has its own weather.

Come for the sustainable organic chocolate, stay for the sustainable organic booze.

A storefront museum in Asbury Park honoring the Jersey Shore’s deep history of mystery—including the Jersey Devil.

Memorial to the 137 lives lost on a ship fire, the whole hulk of which washed up on the Asbury Park shore.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

César Baldaccini's iconic sculpture of a 40-foot thumb stands tall in La Défense.

This castle-like building in Manhattan helped destigmatize cancer in the 19th century.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

Storage warehouse of the rich and famous.