The historic Masonic Lodge in which the first-ever female Mason was initiated.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

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

The headless bodies of more than 1,300 guillotined victims of the Reign of Terror are buried here in mass graves.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

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

This little-known relic crypt holds stolen parts of a Roman Empress.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

A subterranean shelter remains intact under a busy Paris railway station.

How did a French journalist’s grave become the sexiest statue in the cemetery?

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

A unrivaled and rather horrifying collection of wax dermatological models.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

Egyptian Revival movie palace abandoned for decades and restored in 2013.

Statue of death tucked in the University of Medicine courtyard.

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

This 15th century pharmacy displays a beautiful collection of ancient medicine jars.

The mysterious remains of a martyred teenage saint are venerated inside a small country chapel.

A complimentary beverage is offered to the bodega's resident rodents every day.

This embalmed man is one of the best preserved mummies from the Canary Islands.

Holding the current title of "biggest chair in the world," it stands with little fanfare in Lucena, Spain.

Medieval village and microminiature museum.

Part of the medieval watchtower is displayed in an otherwise ordinary parking garage.