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

Please don’t anchor your boat onto the Department of Defense’s underwater data cables.

Recorded as the first person buried in Arlington Cemetery.

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.

This one-room schoolhouse played a significant role in the education of Black children for almost 100 years.

An intricately designed junk art house with four extravagant junk art cars hidden in the suburbs.

One of the largest trees of its kind in California.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

The oldest standing structure in downtown San Diego.

These two K-9 memorials commemorate the sister cities of Edinburgh and San Diego.

This historic Chinese church was relocated and revived as a museum that preserves and celebrates Chinese art, history, and culture.

The classic Atari game's iconic aliens have invaded downtown San Diego.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

For over 70 years, this house was home to a pioneering Black artist and educator.

The oldest surviving one-room schoolhouse in Montgomery County, Maryland.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

These abandoned waterworks are crumbling into the Potomac River.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

Right next to departures—how convenient!

Long buried under the 20th-century landscape, this lift lock of the Alexandria Canal is the lone remnant of an ambitious early American transportation project.