Brussels' favorite peeing boy has a sister.

Cozy basement bar sports an inventory of over 2,000 beers.

Drink among marionettes at this pub inside a historic puppet theater.

The tomb of a hard traveling saint is constantly covered in shoes as offerings to heal disabled youth.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

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

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

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.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This massive library holds what was once the largest book collection in the world.

This small, ingenious cannon once helped regulate Parisian life.

Executions were once held near this beautiful 18th-century fountain.

Noirish green neon marks the location of one of the oldest private detective agencies in France.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

With a history of slaughter, feast, and famine, remnants of the pork industry decorate this area--even its church.

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

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Notorious artist squat renovated into legal studios.

The first green space constructed on an elevated viaduct.

An off-the-beaten-path boutique stuffed with an eclectic collection of upcycled goods.

A tribute shrine where the Space Invasion street art movement started.

The storefront of a ramshackle Parisian puppet theater.