The meeting of the northwestern corner of Delaware, the northeastern corner of Maryland, and the southern edge of Pennsylvania.

Step into a pastel time capsule where candy is truly dandy.

Enjoy a slice while browsing the world's largest collection of pizza memorabilia.

A rare view of a preserved Victorian science museum.

This unassuming passageway played a key role in one of the most important events in U.S. history.

The oldest house in Washington, D.C. wasn't originally constructed in the nation's capital.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

This robust fence in front of a historic Georgetown home is likely made from hundreds of recycled Revolutionary War firearms.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

An ode to one of the first concerts broadcast via satellite.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

This WWII plane died a quiet death, and is now a garden eel playground.

A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

Hundreds of antiquated typewriters and office machinery show the technological evolution of business.

One of the oldest surviving Swedish-American homes in the United States.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

This splendid Versailles-inspired mansion has the largest French-style formal gardens in North America.

The story of a Floridian city as told through an obscure sport for retirees.

Manatees congregate around a power plant's discharge canal where the water is especially warm.

An octet of classic chrome trailers speared into the ground act as a tribute to the silver bullets of the open road.

An oddities shop that dabbles in the deathly and beautiful.