Macabre astrological automaton clock dating to the late 1400s.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

A monument marks the location of the first successful steamboat demonstration.

A massive white oak tree provides a beautiful canopy near a suburban shopping center and stood before the signing of the Constitution.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Dogs, cats, horses, monkeys, frogs, and fish are laid to rest at the second-oldest pet cemetery in the U.S.

The hidden ruins of a mill that is linked to an attempt to assassinate the vice president of the United States.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

One of the only memorials dedicated to journalists who died in combat.

Baltimore's classic clock tower was once topped by a rotating, 20-ton medicine bottle.

An isolated island home to one of the oldest English-speaking communities in the region and Maryland's state dessert.

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

The whole world in one water tank.

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.

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

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

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

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

A Civil War Museum with some notable medical antiques.

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.

This dig site outside D.C. is known for its exceptionally high density of baby dinosaur fossils and dinosaur eggs.

This Maryland farm is known for its amazing corn mazes and its 30-foot junkbots.