A sprawling maze of used books piled from floor to ceiling.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

One of the largest free-standing structures ever built, this dirigible hangar is now simply a giant skeleton.

From the Difference Engine to the Cray-1, all under one roof.

A humble garage, world-famous for being the epicenter of a technology revolution.

An ominous concrete cube cuts a dystopian silhouette atop this California mountain.

This 252 step staircase offers stunning views of San Jose.

The headquarters of a secretive order is also a beautifully-designed park.

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.

Three plaques mark the spot where the "forgotten father of broadcasting" worked.

The largest permanent Monopoly board makes one of the longest games even bigger.

It took years to decode its mysterious messages.

It is locally loved and ridiculed for literally looking like poop.

The oldest house in the capital of Silicon Valley.

Old neon signs from the City of Brotherly Love provide a snapshot of the city’s evolution.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

Memorial to the 137 lives lost on a ship fire, the whole hulk of which washed up on the Asbury Park shore.

Marie told fortunes from her small stand on the Boardwalk for decades, including to a young Bruce Springsteen who would busk outside her booth.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

A wooden theatre that remains the heart of a charming Victorian-era New Jersey enclave.

One of New Jersey's oldest churches is a historical treasure trove.

This water tower commemorates the invention of the transistor on this site in 1947.

This giant satellite antenna services the transmission needs of government agencies and cable programmers.

Where the embers of the Big Bang were first detected.