Ordinary art transforms to extraordinary thanks to locals' quirky sense of humor.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

The curious underground history of keeping Paris clean.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The subterranean "lake" below the Paris opera house inspired the Phantom of the Opera's lair.

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

This Parisian café sticks almost exclusively to an ethos of reuse.

A haunting collection of the vanished and disappearing natural world.

Notorious artist squat renovated into legal studios.

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

Abandoned railway line circling the city of Paris.

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

This historic electric train has operated with regularity since the early 1900s.

One of Europe's largest supercomputers is housed inside of a disused chapel.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Barcelona's only remaining tram system takes riders to the Tibidabo funicular.

For one day every month Barcelona's Estació de França transforms into a market for model trains.

Week-long block party becomes a competition for the best decorated street.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.

This semi-secret storybook hedge maze is also the oldest garden in the city.