A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

An unassuming, powerful monument north of the U.S. Capitol bears witness to the resilience of Japanese Americans during a time of grave injustice.

There’s a hidden military meme engraved on the World War II Memorial.

People escaping slavery may have hidden inside a corpse vault.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

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

The former home of Thomson Francis Mason, the mayor of Alexandria from 1827-1830.

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

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

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

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

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

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

The highway's southernmost spot is a beloved local attraction.

The island residents are known for taking their quirky sense of humor with them to the grave.

A monument celebrating the idea of reaching inaccessible places.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

This small, unassuming street is now a canvas for color and creativity.

A geological mystery on Camelback Mountain.

Three hundred years of preserved Spanish colonial history in San Antonio.

A gorgeous garden oasis with winding paths, stone bridges, and a troubling history.

Miraculous tree that seems to sprout out of solid rock.