The birthplace of the Herndon Gas Company.

A lone historical marker off the highway and scattered debris are all that remain of this Cold War-era missile site.

Burke’s oldest cemetery also houses the victim of the county's grisliest murder.

The well-preserved remnants of a bridge that once made up a WW1-era military railroad.

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

The last early 20th-century schoolhouse in Fairfax County has galvanized the community and engendered a spirit of service among residents.

This former Cold War missile control site played an important role in the creation of GPS.

A 14-foot monument marks the resting place of two of the town's earliest residents—and one unknown soldier.

The last of Fairfax County's one-room schoolhouses.

This little brick tunnel built by Confederate forces was used to conduct surprise attacks on the railroad.

A double agent hid information for the Soviet Union beneath this bridge for more than 20 years.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

America's first federal monument.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

This grave marks the passing of a historic Jane Doe whose identity remains a mystery to this day.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

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

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

The narrowest house in America is seven feet of pure spite.

Built to defend Washington D.C. during the Civil War, this fort became a post-war nucleus for a thriving Black community.

This cannon dating to 1755 has stood guard at this suburban intersection since 1915.

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

Built in 1945, this historic train station has a new lease on life with its baggage area serving as an event space.

Giant acorn-shaped 19th century gazebo from which suburban Washingtonians gazed upon the original "silver" spring.