On this Polish road, an optical illusion makes cars seem to roll uphill.

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

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

This antique thermometer honors the creator of the first universal temperature scale.

This towering statue of Jesus provided internet to the surrounding area.

One of the world's largest collections of medieval religious art.

This enormous 32-foot painting depicts Poland's greatest medieval battle in glorious detail.

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.

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

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

In the summer, the area around this sculpture transforms into a vibrant concert venue.

This fairytale medieval church in Poland originally spent centuries in Norway.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This fairytale inspired, warped building houses restaurants, shops, and a radio station.

This Communist-era residential block is one of the longest residential building in Europe.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

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

The Sun King's military models, saved from the Louvre.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

This surreal statue brings a famous French novel about a supernatural cad to arresting life.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.