Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

Inspired by "The Starry Night" this Dutch bike path turns into a glowing work of art each night.

No need to strap in for a "ride" on this walkable roller coaster.

A masterpiece of Art Deco architecture hidden in plain sight in West London.

This artificial lake surrounded by Brutalist architecture served as a stand-in for futuristic Britain in Stanley Kubrick's 'A Clockwork Orange.'

This hidden green space is the city's second largest conservatory.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Thousands of flowers create enchanting pink tunnels over the city streets.

This strange building looks like a medieval fortress crashed into a 1960s Brutalist office block.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

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

This controversial monument was designed to lionize the Red Army, but also disheartened the Latvian people.

This charming Latvian lane doubled as Baker Street on the Soviet Union’s version of Sherlock Holmes.

The oldest housing complex in Riga is a mini timeline of architectural trends.

3,000 market stands in five former Zeppelin hangars.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

Only museum in the world devoted to bookbinding and book arts holds a permanent collection representing five centuries.

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

A moving and macabre World War I-era painting by the great artist Otto Dix.