Stripes of human ashes cover a back lawn in the most sought-after burial grounds in Paris.

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

This Parisian fountain is a little bit fantasy and a little bit nightclub.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

This museum houses an imposing skeleton army comprised of creatures great and small.

A haunting collection of the vanished and disappearing natural world.

The first green space constructed on an elevated viaduct.

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

France's national museum of scientific and industrial instruments.

A mechanized clock where a man fights off a dragon, crab, and rooster.

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

This sublime architectural marvel is a rare example of an expressionist church.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Hans Christian Andersen for the postmodern world.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

An Irish cemetery filled with victims of political strife and violent conflict, including the grave of Bobby Sands.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

More than 5,000 artifacts donated by the people of the city, plus a room entirely devoted to the band U2.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

Local legend says the remains of Father Christmas lie within the medieval grounds.