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

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

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.

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

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

Special benches that play Chopin's music are scattered throughout his native city.

This bell stars in a tragic love tale and is said to make wishes come true.

This biographical museum honors the groundbreaking scientist at her birthplace in Warsaw.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

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.

Legends surround an ancient tree trunk riddled with nails for good luck.

Preserved baths in a Victorian-era spa town frequented by the most famous people of its day.

One of these two land speed record-breaking vehicles went so fast it shattered the sound barrier.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

Paris' linguistic guide to the international language of, yes, love.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.