Bizarre Cavern.

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

A superbly preserved example of Georgian residential architecture that was once home to one of the founders of Alexandria, Virginia.

A massive, majestic mammal watches over pedestrians from his perch atop a former B.P.O.E. lodge.

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

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

This unique structure is the only one of its kind in Virginia.

A monument marks the location of the first successful steamboat demonstration.

The Aldie Gristmill was once the largest factory of its kind in Loudoun County.

This unique historical monument features large concrete spheres designed to resemble fallen stars.

This twice-relocated "Usonian" home is among the smallest built by master architect Frank Lloyd Wright.

This church is known as "The Home Church of George Washington and George Mason."

Standing for over 200 years, the abandoned home of a Revolutionary War hero and later a succession of prison superintendents.

This field of concrete was once an active defense site armed with nuclear warheads.

A weathered, American Foursquare-style house originally built for lumber merchant William Wimsatt.

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Home to items never before seen by the public.

The site of the climactic scene from the classic horror film is now a historic landmark.

The Corinthian columns that towered over Abraham Lincoln’s inauguration stand proud.

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

This general store is more than a century old and home to various oddities and antiques.

A giant time capsule not scheduled to be cored until 2040.