A marvel of Byzantine engineering under the streets of Istanbul.

Inspired by the Rialto Bridge in Venice, these three clustered bridges were just one part of a Slovenian architect’s grand vision.

A public work of art that also provides some relief from the summer heat.

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

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

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.

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

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

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.

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

A statue honors the children who fought Nazis in Poland.

A 20th-century picture show in 3-D.

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

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

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.

Krakow's own version of the Hollywood Walk of Fame.

A 19th-century pharmacy converted into a bookstore.

A sculpture of the beloved author surrounded by characters from his fairy tales.

A serene memorial that honors the adventurous spirits of climbers who lost their lives in the High Tatras.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

One of Vienna’s oldest (and perhaps most haunted) alleys, allegedly with a bloody past that gave it its name.

The world’s oldest military museum has remained largely unchanged since the last days of the Austro-Hungarian Empire.