Built in 1815, the stabilized ruins of the grist mill and sawmill are now gated, but interpretive displays on the features and functions of the mill preserve its history.

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

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

A Maryland museum dedicated to Black history, housed in a historic church.

A relic of FDR's brief foray into utopian urban planning.

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

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

Explore the legends surrounding these mythical sea creatures inside this museum.

A historic cemetery filled with quirky faux wood art and unique tombstones.

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

The childhood home of the Sultan of Swat is just a line drive away from Oriole Park at Camden Yards.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

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

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

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

Meet some of the most prominent figures in Black history through life-sized wax models.

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.

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

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

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.

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

The land is home to swimming ponies and a legendary 18th-century treasure.