Despite violent work crews and massive delays this abandoned canal tunnel was built to last into the modern day.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

A museum dedicated to the history & joys of the trail & your best chance to see hikers throwing up ice cream.

The Decoy Capital of the World.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

An original apothecary from 1792.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

A computer bug so primitive it was an actual insect.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

This grand gothic brewery has been pumping out suds for over a hundred years.

A nostalgic bibliographic gem.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

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

The 320-year-old tree that greeted General Lafayette and rerouted an interstate highway.

A star fort along the C&O Canal in western Maryland that protected America in three wars.

Historic home of America's sweetheart sharpshooter, Annie Oakley.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

A cave on the Maryland border where civilians took refuge during the bloodiest battle of the Civil War.

A labor of love built by local hang-gliding enthusiasts, this ideal launch spot was outlawed by the authorities and has since been largely abandoned.

This scenic Maryland park was the site of one of the worst prison camps of the Civil War.

Captain John Smith thought these cliffs were amazing in 1608 but sharks thought so 20 million years before him.