A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

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

On a winding Vienna side street, one museum has turned their windows into a monument to history’s peace-minded heroes.

Baroque celebration of the end of the Great Plague of Vienna.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

Fantastic stories on a miniature railroad.

This extensive collection covers thousands of years of Polish military history.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

Atop this library is one of the most beautiful green spaces in Warsaw.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

This World War II airfield enjoys a second life as a public park.

Winter roadtrips are a little more exciting on this seasonal, slippery expansion of Sweden's national highway system.

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

Nordic giants resurrected from the sea and restored to their former greatness.

Few remain of these distinctive old trees that once served as natural landmarks for travelers on the road.

These coffin-like Brutalist balconies were inspired by a nearby mine.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

See the rare bloom of the "Queen of the Night" cactus at one of the world's largest succulent collections.

An interactive exhibition space dedicated to the kinetic sculptures of Swiss artist Jean Tinguely.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

The house where a Danish physicist discovered the connection between electricity and magnetism.