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

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

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

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

Apartment complexes built into huge repurposed natural gas tanks.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

Legends surround an ancient tree trunk riddled with nails for good luck.

Baroque celebration of the end of the Great Plague of Vienna.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

Epicurean and holy traditions converge in what may be the oldest restaurant in Europe.

These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

The medieval network of canals hidden underneath the city is opened to explorers each year.

This strange statue features a bust of the famous composer plopped atop a woman's body.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

All unmarked mute swans on the Thames are owned by the Queen per a tradition that began in the 12th century.

At just 51 feet and 10 inches long, it's the shortest street in England.

This is Britain's one and only clock concealed in the pavement.

A replica of the steam engine that hauled Queen Victoria's Royal Train is on display at Windsor.

The scorched Lisbon church that survived two earthquakes and a massive fire.

These 11,000-year-old mounds may be the oldest known human-made structures in the Americas.

This 19th-century sugarcane plantation is one of the most well-preserved estates of its kind, including its original quarters for enslaved laborers.