Hundreds of skulls and bones at the largest skeleton museum in the country.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Medicinal spa created with the discharge from a geothermal energy plant.

Most-visited and most-photographed slot canyon in the American Southwest.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

Rippling sand dunes frozen in the Arizona rock.

On Japan's Tashirojima Island, cats are king.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

The largest toy museum in Poland showcases Europe's history of childhood.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

The traditional Polish croissant, folded 81 times into the shape of a horseshoe, is a legally protected cultural treat.

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

A huge wooden clock that is so beautiful its creator was forcibly blinded.

Museum dedicated to "the man who moved the Earth."

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

Warsaw's fantastically preserved gasworks...almost.

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.

An abandoned Nazi explosives plant founded by the inventor of dynamite is now an underground museum.

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 site of the first battle of World War II.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.