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

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.

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

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

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

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

A haunting exhibit in a wildlife refuge center highlights threatened species and the conservation efforts needed to save them.

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

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

A remote horde of architectural treasures fit for Indiana Jones.

A Civil War Museum with some notable medical antiques.

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

Ship skeletons haunt Baltimore's waterways.

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

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

After hundreds of years of settlement, this once-bustling fishing village sunk into the Chesapeake Bay.

The shelves in the back of this thrift store are devoted to saving, not selling, retro tech.

This abandoned sea fort has become an accidental bird sanctuary.

A model home in the Medical Examiner's Office in which grisly death scenes are staged to train forensic investigators.

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

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

The ruins of this long-abandoned unsuccessful gold mine can still be found.

This beloved Baltimore spot features caged dolls, a giant Pez collection, and many, many mannequins.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.