One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

Nature and art meet in this curvy creation

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

Op-art architecture designed for happiness.

The original movie set for the home of 'Star Wars' hero Luke Skywalker.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

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

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

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

Fantastic views and thousands of love locks.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Hamburgers are intensely proud of their tunnel beneath the river.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

Lyon's miniature version of the Eiffel Tower was built as a statement in support of French secularism.

This hidden garden boasts amazing views of Lyon.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

Hundreds of hidden passageways weave through the old quarters of Lyon.

A brutalist gem towering over the heart of Milan.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

A Milanese café entirely designed by the American director Wes Anderson.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A stunning gilt bronze relief denounced by Hitler as "degenerate art"—even though it was dedicated to the Nazi leader.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.