Two buildings named after their windows that make it look like a sea of television sets plastered to a wall.

An Art Deco Icarus statue adorns this abandoned gem of Yugoslav Modernist architecture.

This feat of Brutalist architecture is also known as the Three Sisters.

A small memorial to a deadly night in Serbia that shook the world before it was swept under the rug.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A pair of connected skyscrapers form this symbolic gateway.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

A silly medieval mural preserved on the side of a Viennese house.

The resting place for anonymous victims of the Danube's dark waters.

Op-art architecture designed for happiness.

A spherical "micro-nation" in the heart of Vienna.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The beautiful baroque library of the Hapsburg empire.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

A 19th-century home, embellished with gnomes.

In the Swedish forest stands a stone with a deadly inscription, promising ruin and death to whoever disturbs it.

Location of a royal cave rave in the 1800s, now largely forgotten.

The best-preserved weaving mill from the early 20th century in all of Scandinavia

An Ice Age rock grotto autographed by royalty.

Old ruins of a church from the 1200s.

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

A house that transports visitors back to Yugoslavia.