A perfectly circular lake is formed by the crater of an ancient underwater volcano.

Europe's oldest still-operational tea farm also boasts a spectacular view.

Legend has it the lovelorn tears of a princess and a shepherd boy formed the blue and green twin lakes in the Azores archipelago.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

This legendary city has been a tourist attraction for centuries.

Built by the Ancient Greeks, this chariot bridge is still in use today.

These caves secretly held national treasures during World War II.

An ancient octagonal weather station named for the eight Greek gods of wind.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

The silly symbol for an underground protest group is now scattered around the city.

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

Catch a scenic view of Warsaw's Old Town from the top of a centuries-old dumping ground.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

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

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

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.

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

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

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

Hundreds of notes give thanks to the patron saint of lost causes.

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.

Now home to a drinking establishment, this building has a macabre history.