A suburban museum tells the story of a historic transportation network and even provides rides in antique trolley cars.

The bridge's highly-contested plaque (once again) honors Confederate President Jefferson Davis.

A swimming hole in the historic industrial quarry that supplied the marble for the Baltimore Washington Monument.

Tiny observatory made big contributions to the study of the Earth's motion.

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

The world's oldest continuously operating airport was founded by the Wright Brothers.

Three abandoned missile silos are hiding in plain sight behind a suburban development in Maryland.

The development and impact of electronic media showcased in a picturesque farmhouse in Maryland.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

Electronic inventions that resulted in products and systems we use every day are on display in this labor-of-love museum.

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

The Forest Service's surprisingly sophisticated collection of wildfire prevention art features America's most beloved bear.

Politicians, bureaucrats, and military officers gathered in this field near the Capitol to settle their disputes with blood.

The whole world in one water tank.

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.

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

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

A Civil War Museum with some notable medical antiques.

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

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

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

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