Hidden in the plaza next to a pizza shop is an amazing little oddities shop.

Journey through a collection of over 35,000 Halloween items from all generations.

Where beautiful signs live on forever.

The first and only museum dedicated to stained glass and horology opened outside of Chicago in 2017.

A science teacher's dream.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

This shop for all your super spy needs hides an educational secret.

This peaceful Massachusetts graveyard was one of the first "garden-style" cemeteries in America.

Located in a beautifully restored ice house, this museum is the result of decades of hard work and devotion to the craft of plumbing.

A steampunk wonderland that preserves America's history of industrial innovation.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

One of two lighted lanterns hung in the church belfry on the eve of the Revolutionary War to warn that the British were on their way.

This small section of the Sleepy Hollow Cemetery is rotten with famous authors' graves.

Run by a eugenics advocate, this aging institution conducted secret radiation experiments sponsored by Quaker Oats.

This headstone-like marker inscribed with three words has been an utter mystery for over a century.

This Massachusetts home was the first to have a telephone line and its own phone number: 1.

Washington's top-secret Cold War-era doomsday communications tower is located in a small neighborhood park.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

A haunting tribute to pioneering photographer Clover Adams.

A super-sized promotional trick that is now a D.C. landmark.

A tiny piece of the Moon is embedded in this stained glass masterpiece.