This unassuming home was once “grand central station” for the Underground Railroad.

This library and museum is dedicated to the life and literature of the Indianapolis native author.

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

The Kalamazoo factory has 100 years of instrument-making, and one big wartime secret.

Abandoned concert venue legendary for its rock counterculture.

A bronze plaque at an intersection in Hoboken marks the place where the game of baseball first took shape.

The only remaining piece of hull of the most decorated US ship of WWII is this giant name plate.

The final resting place of many of New Jersey's most famous residents, including U.S. history's most in-vogue antagonist, Aaron Burr.

Where the embers of the Big Bang were first detected.

Inside this Jewish cemetery is a memorial to soldiers who deserted the German army and were executed.

Cold war icon and onetime "hole" in the iron curtain.

From Iggy Pop to David Bowie to Nick Cave, this regal music studio has served some of the all time greats.

A fascinating insight into daily life in the Eastern Bloc.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

The oldest military monument in the United States.

The decaying ruins of a failed mining company’s water diversion project cling to the side of a desert canyon.

A stark reminder of the huge nuclear weapons plant that once stood on the site and its effect on the surrounding area.

The clock that sets them all.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Statue commemorating the use of ether in anesthesia.

Walk in the footsteps of the gods and straddle two tectonic plates.

This no man's land slicing through the island is strewn with abandoned relics of another time.

This former Cyprus flight hub is now a crumbling, abandoned ghost complex.

Where the alchemists dream of transmuting base metal into gold was actually achieved.