When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

The Habsburgs' royal collections of art and wonders.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

An Art Nouveau building covered in animal gargoyles and grotesques.

The deepest metro station in the world.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

340-foot statue built to honour the Heroes of the Soviet Union.

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

Oriental bazaar in the heart of Sarajevo.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Gargoyle head that brings good luck.

The world's largest historic armory was established by independent citizens to defend themselves from the wars of larger forces.

Double spiral staircases are not unheard of, but they are very rare.

Austria's ultra-modern art museum looks like Cthulhu's giant alien heart.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Op-art architecture designed for happiness.

Apartment complexes built into huge repurposed natural gas tanks.

Festival of Perpetual Life and Rebirth.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.