"X" marks the spot of an echo chamber in the middle of a plaza.

This bar hosts an ever-evolving napkin art installation devoted to an American president.

This South Carolina water tower is an icon of the city of Walterboro, but it also once served as the county jail.

A rare example of a rural school in Washington, D.C.

The Conduit Road Schoolhouse is one of the last one-room schoolhouses remaining in Washington, D.C.

A glimpse into early 19th-century education.

Conveniently located within binocular range of a nuclear bunker, the "summer camp" area was a painfully obvious spy house.

The longest-covered bridge in the state of Maryland.

This historic lighthouse was well known for the large number of women who served as its keeper.

The Decoy Capital of the World.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

The last vestige of a once substantial orchard and farm in the suburbs of Northern Virginia.

Mysterious installations bring levity and light to a sometimes stodgy city.

The ruins of an 18th-century mansion that was once named "Mistake" by the man who had it built.

The final resting place of a physician rescued during the bombardment of Fort McHenry.

Evidence of a long-ago crush remains scratched into the glass at this historic Maryland House.

Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

One of the few remaining covered bridges in Lancaster County.

Dedicated to a U.S. Army lieutenant colonel who was also a bird watcher and artist.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

The first of Lancaster's "rural cemeteries."

In this cemetery stands the country's first public crematorium.

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.