This graffitied 19th-century building was a prototype of European industrial architecture.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

After sitting unused for decades, this abandoned communist infrastructure became a wildlife utopia.

A living descendant of the famous tree that helped Isaac Newton develop the theory of gravity.

The standard measure of Lagom, a measure of what is enough.

The indecision over what to place in this square was immortalized with a plaque.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Handsomely crafted representations of our round planet.

Museum devoted to the artificial language of Esperanto.

A 200-year-old tavern challenges guests to finish a glass of wine while hanging from a ceiling beam.

This massive boulder was hurled into a Zurich church when a gunpowder depot was struck by lightning in 1652.

Zurich's evolution museum hosts a unique collection of skeletons among its natural history treasures.

A rare, flower-shaped example of Brutalist architecture in Switzerland.

Where Mary Shelley’s "Frankenstein" and John William Polidori's "The Vampyre" were born.

An early masterpiece of Le Corbusier, a famed Modernist architect, hiding in plain sight.

On the side of a building, a depiction of the woman who became a local legend by tossing soup out her window.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

A sharp sculpture made of thousands of pieces of jagged glass.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Luminaries of all stripes have sipped strong Greek coffee at this cafe since 1839.

An ancient octagonal weather station named for the eight Greek gods of wind.

This small museum once served as a royal hunting pavilion for King Otto Friedrich Ludwig.