Medicinal spa created from the mineral-rich runoff of a geothermal power plant

This verdant, tree-lined Reykjavik graveyard is both enchanting and eerie.

This aromatherapy shop and mini-museum cofounded by the Sigur Rós frontman documents Icelandic history through scents.

This stunning concert hall has become a symbol of Iceland's national recovery.

An encyclopedic collection of mammal penises.

This tiny museum's sizable collection is jammed into a former underground public toilet.

A national collection of Communist-era musical posters.

This extensive collection covers thousands of years of Polish military history.

This enormous 32-foot painting depicts Poland's greatest medieval battle in glorious detail.

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

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

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

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.

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.

The final resting place of more than 200,000 people, this is one of the largest cemeteries in Europe.

These plaques found across Warsaw commemorate the sites where executions or battles took place during the German occupation.

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

Once a giant gingerbread factory, this space now hosts exhibits and workshops on the historic treat.

A homage to the King at the hotel where he revived his career.

The narrowest street in Canada was once a spot for dastardly doings, now a historic piece of Chinatown.