Every summer, the Mendenhall River greenbelt comes alive with an explosion of magenta flowers.

A synth musician's paradise at the heart of a community responsible for the soundtrack to 'Stranger Things.'

A former electrical substation is now home to an eccentric junk art masterpiece.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

Come for the flowers, stay for the bats!

A mythical garden that once grew the golden apples of wisdom is said to have existed in this ancient Moroccan city.

A museum dedicated to secret surveillance.

According to a local legend, this old castle could only be built after a woman was immured in the walls.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

This neighborhood thoroughfare is haunted by dozens of homemade monsters.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Floating swimming pool within a moored vessel.

A 12th-century fortress containing some of Berlin's oldest buildings.

The most visited, and possibly most controversial, museum in Germany.

This interactive sculpture allows visitors to leave a message in case a friend passes by.

An Argentinian businessman facing terminal cancer built this whimsical medieval village using salvaged materials.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

A two-way chairlift system between Zugliget and the highest point in the city.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

A unique housing complex born from the aftermath of the Greek Civil War.

This once architecturally advanced housing complex is now a haven for squatters that still bears the scars of war.