Canada's oldest railway tunnel is illuminated in a rainbow of color as it passes under the streets of this small city.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A public work of art that also provides some relief from the summer heat.

When this monument to Slovenia's national poet was erected, it's said to have sparked the ire of nearby church authorities.

What looks like a normal building is really a hollow facade hiding a subway vent.

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

Paris' linguistic guide to the international language of, yes, love.

A museum dedicated to one of Paris’s most famous residents, tucked into a corner of one of the city’s most famous squares.

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

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

This retro diner claims to be the birthplace of poutine.

In 1988, jazz legend Chet Baker fell to his death from a window of this hotel facing Amsterdam Centraal.

The attic of a four-century-old canal house hides a clandestine church.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

The cutest way to stay safe in traffic.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Lavish royal estate punctuated with heated greenhouses.

This annual Belgian water race attracts bathtub captains from all over the world.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.