Over 20,000 sets of spice shakers reveal the surprisingly telling history of our most basic spices.

The world's largest version of this iconic puzzle cube is located in Knoxville, Tennessee.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

This hotel was used during the Manhattan Project to house official visitors.

The secret city built by the Manhattan Project.

Pilgrimage site for star-crossed lovers.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

Oddly shaped rock formation, misassociated with a nearby utopian community.

Where a guard killed nine German prisoners during one of the worst 20th-century POW camp massacres in U.S. history.

A house carved into a rock in the 1940s.

A cemetery full of touching tombstones from a community of railroad workers, uranium miners, and Cold War missile launchers.

Learn the fine art of making a centuries-old treat at this hands-on food museum.

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

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

Inside this Krakow church, an explosion of psychedelic color.

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

A statue commemorating a Polish dog who took his role as man's best friend very seriously.

In the midst of a living monument to Soviet social engineering, Polish Catholics built this church by hand.

This grubby wall is said to be one of the Earth's esoteric energy centers.

Down this Cracovian street resides a plaque with a stark message about the city's air pollution.