Genesis of modern hydroelectric power.

One of many reminders of Tesla's scientific contributions overlooks the falls which inspired him.

This chestnut box will not be opened until the country music legend's 100th birthday in 2046.

An ode to "The Queen of Appalachia."

While knives are the main feature in this store, visitors will also find dinosaur bones and meteorites.

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

An abandoned town is hidden in Great Smoky Mountains National Park.

The secret city built by the Manhattan Project.

All that's left of the quintessential "cabin in the woods."

Once the largest attraction in Rhode Island, this former amusement park is now a gorgeous coastal state park.

Play over 120 retro arcade games and pinball machines at this throwback museum.

This liminal destination combines creaky carnival rides, a classic car museum, and luck-of-the-draw flea market finds surrounded by dust and drive-in movie screens.

World's largest magnetic research facility.

The unique collection includes bronze cast handprints of some of America's most famous astronauts.

A building so large that it has its own weather.

This abandoned NASA launch site is now a memorial to a trio of astronauts who were killed there.

A synth musician's paradise at the heart of a community responsible for the soundtrack to 'Stranger Things.'

This pseudo-steampunk weapons facility is the world's largest wood and glue structure, and packs quite a wallop.

An enormous factory from the late 1800s sits abandoned on Cleveland eastside.

A dormant lightning machine equal to all the power in Russia.

Pickles belong on pizza and this freewheeling outpost proves it.

A tribute to the hard-working men and women of Grumman, who crafted F-14 fighter jets.

The second-largest (of only two in the world) large particle collider is the underdog of experimental physics.

The first commercial nuclear power plant constructed on Long Island.