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

Once America's tallest structure, now a Baltimore landmark.

An abandoned church gets a second life as a massive beer hall and event space.

This one-room cabin where the young colonel slept during the French and Indian War.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

Rediscovered after a century, the father of the American Navy was reinterred in something dredged up from Davy Jones' Locker.

The whole world in one water tank.

Easter in Westminster may be the only time and place to behold Edgar Allen Poe made entirely of Marshmallow Peeps.

Fascinating museum dedicated to the under-appreciated medical history of urology features some wince-inducing devices.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

Two dozen pinball games hidden away inside a most unlikely location.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

Brain collection and database that narrows the gap between man and animal.

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.

A remote horde of architectural treasures fit for Indiana Jones.

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

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

This abandoned Victorian-style house was built in 1884.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.

A remarkable time capsule of American manufacturing deep in Maryland coal country.

Built by the patriotic residents of Boonsboro in a single day.

A Civil War Museum with some notable medical antiques.

Live data is transmitted from the Atlantic coast to instantly recreate the ocean waves in this fountain at the NOAA headquarters.