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

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

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

A lush vertical garden blooming in the heart of Paris.

The celebrated eyesore created by starry-eyed sweethearts.

The video game-themed street art first popped up in the French city.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The narrowest street in Paris.

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

This impressive castle looms over small German town.

A park where the Inn and Ilz rivers join the Danube as it slinks off into Austria.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

Shimmering sea-colored mosaics and Jesus statues cover this opulent building.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

A concrete mushroom that divided Stockholm residents for nearly a century.

Stockholm's narrowest alley is barely over two feet wide.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

Stockholm's deepest subway station is also a stunning ecological wonder.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This stunning limestone waterfall is the highest in Estonia.

Historic slum of Tartu.