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

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.

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

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

This 13th century Gothic brick castle is the largest in the world by surface area.

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

The oldest church in Mantua was buried for centuries under the facades of other structures.

The seat of the Mantua bishop holds many secrets within its walls.

This massive blockhead sculpture hides an entire library.

A patchwork of ruins from various civilizations in one of the world's oldest continually inhabited cities.

Inmates dig the graves at the largest prison cemetery in the U.S., the final resting place of both cowboys and Indians.

An ancient Phoenician citadel once stood at the site where Queen Dido first landed, according to legend.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

The best-preserved Roman small town in North Africa.

An underground city of salt.

Vibrant street art created with mixed media.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

Khmer Rouge's high security prison.

The only quarter of the Old City not dedicated to a major world religion.

A "miracle" that seems to produce more holy fistfights than holy revelations.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

Dozens of elegant ceramic tiles decorate these ancient walls, each displaying the Lord's Prayer in a different language.

The castle where Martin Luther secretly translated the New Testament from Greek to German while in hiding.