This one-room schoolhouse played a significant role in the education of Black children for almost 100 years.

This suburban house is made of dirt, and almost sparked a revolution in home construction.

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

This bell is one of the last remnants of the lost city of Triadelphia.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

Proto-CIA agents trained with grenades in the sand traps and fired machine guns from the fairways.

One of the oldest standing structures in Montgomery County, Maryland.

This mighty white oak in Bethesda survived both the American Revolution and the construction of Washington D.C.'s metro red line.

FDR's Art Deco hospital tower was hopelessly inefficient.

She stares out across six lanes of traffic, clutching a musket and infant with determination.

Surrounded by traditional homes, this Tolkien-esque dwelling stands out on a quiet street in suburban Maryland.

Take a trip to the past aboard a 1920s railcar or open flatcar for a scenic ride through Maryland farm country.

Its diverse collection of computers and technology spans the ages.

This iconic Lancaster everyman has been reading the same story since 1980.

The oldest farmer's market in America is so ancient it was approved by the King of England.

The grounds of former plantations where abolitionist Harriet Tubman spent her youth enslaved are now a museum to her incredible life.

This 1830s store is believed to be the site of Harriet Tubman's first stand.

Both the building and blades of this reconstructed 19th-century windmill can turn in a breeze.

The United States' oldest Episcopal church still in active use.

The elevator hidden in a smokestack on Roosevelt's yacht now serves as a monument to the former president.

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

A small ballpark on Maryland's eastern shore pays homage to its favorite son, the most fearsome home run hitter of the dead ball era.

The only one-room schoolhouse remaining in Talbot County, Maryland.