The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

This icon of the Atomic Age now lays dormant.

Despite being stolen multiple times, this civic electrician's street corner Snoopy won't be stopped.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

This jail which was in service for over a century is now open for curious visitors.

Step into a pastel time capsule where candy is truly dandy.

An 18th-century Catholic church converted into an eccentric temple of music and bacchanalia.

Instruments, apparatus, and rare books all relating to chemistry and its related sciences.

This semi-spooky remnant of an abandoned hotel provides fantastic views.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

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

This restaurant offers a side of antiques, curios, and a bathroom chock full of owls.

This public space is speckled with the eerie remnants of a defunct amusement park.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

A sacred collection of indigenous rock art.

For decades, it has disappeared and reappeared as water levels rise and fall.

Burping, gurgling geothermal mud pots by the Salton Sea.

This sun-scorched lakebed contains samples of half the natural elements known to humankind.

These four islands right offshore have waterfalls, colorful lights, fancy buildings, and a secret purpose.

Machinery left over from California's once thriving mercury industry now attracts artists and explorers.

For roadside fast food, pull over at the giant orange.

The exterior of this home was used for the hit television show, The Brady Bunch.

A 1950s Googie burger stand is now a Los Angeles landmark.