The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

The first American department store, and home to the largest operating musical instrument in the world.

Five candy-colored villages on the Italian Riviera.

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

A statue honors the children who fought Nazis in Poland.

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

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

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

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

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

An underground city of salt.

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

An encyclopedic collection of mammal penises.

This five-foot-tall bronze bird is a memorial to a species that was hunted out of existence.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

This eye-popping Icelandic crater lake is surrounded by red volcanic rock.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

Three columns of volcanic rock shoot out of the ocean.

Twisted girders are all that remain of an Icelandic bridge that was wiped out by a combination of volcanic heat and glacial floods.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

These enlarged egg sculptures represent the native birds of eastern Iceland.

This canyon is comprised of gorgeous waters and magnificent basalt columns.

A sulfuric martian landscape that looks far better than it smells.