Notorious artist squat renovated into legal studios.

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

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

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

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

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

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This bridge was constructed from the rubble of the infamous Bastille.

Former hunting lodge of a duke who was an avid collector of impressionist works.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Old Danish castle immortalized in Shakespeare's Hamlet.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.