An underground city of salt.

The last king of Poland was interred in this church nearly 200 years after his death.

This colorful and quirky set of pegasus sculptures celebrate the works of poet Zbigniew Herbert.

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.

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

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

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

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

A farm in New Jersey grew a most unusual crop for AT&T's testing purposes.

The bronze uniforms commemorate the vital role of women during World War II.

The "beautiful" equation predicting the movement of all electromagnetic particles is engraved in front of Newton's tomb.

It holds a fabulously designed tribute to astronomer Edmond Halley.

A friendly pub with a sordid past in cock fighting.

Hear the quietest sound from across the dome.

A naturally mummified 2,000-year-old man.

A memorial for public executions that dates back to the 14th century.

An architectural oddity hides in plain sight on this iconic London bridge.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

This centuries-old pub boasts a collection of more than 4,500 snippets of neckties from around the world.

In addition to escorting prospective couples to and from ballrooms, this lane was also a place for gentlemen to settle scores.