One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Real bones which are said to have belonged to a Polish dragon.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

These abundant, over-the-top monuments are so widely scattered that they define the entire compact capital cityscape, often leading to jokes about whether there are more statues than residents.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

Lumps of significant stone from around the world surround a flaming monument for peace.

The location of the world's first telescope demonstration.

A bridge that has seen many reiterations over its lifetime.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This massive monument was unveiled the day Kosovo declared independence from Serbia.

A futuristic, brutalist masterpiece that is also strangely prison-like.

A 11-foot former president stands on a Kosovo street that also bears his name.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

At less than four inches in height, this iconic fictional character is the smallest public statue in all of Moldova.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

A curious cave church carved into the face of a cliff.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.