Seller of surplus nuclear research materials.

This museum started as a collection of Manhattan Projects and continues to add exhibits as they are declassified.

This innocuous New Mexico storefront was once the secret jump-off spot for Manhattan Project scientists.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

The Hudson River School comes alive at this palatial estate.

"Gnome Chomsky" was once the largest gnome in the world, but is now simply tall for his kind.

A living archive of urban activism and space reclaimed.

The first American axe throwing club.

A museum dedicated to the strange and extravagant costumes and memorabilia of the mummers, a tradition older than Philadelphia itself.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

A rare view of a preserved Victorian science museum.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A layered tribute to the work of mosaicist Isaiah Zagar.

America's post-nuclear-attack chambers of Congress.

A bunker "with enough U.S. currency to replenish the cash supply east of the Mississippi" in the event of nuclear war now protects nitrate film.

The "original web site," this farm in Northern Vermont encourages orb-weaver spiders to build their daily webs, and then sells the preserved masterpieces.

This small museum dedicated to the painful memory of segregation is essentially a time capsule.