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

One of the few remaining carousels built by master amusement park carver Charles I.D. Looff.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

San Diego's most historic and haunted home.

An inconspicuous footbridge beloved by San Diego locals.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

This mysterious structure by the Washington Monument is a flood barrier designed to protect the White House against rising waters.

This nine-story building is the oldest standing skyscraper in D.C.

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

Before Metro, Washington had a robust streetcar network—and you see the remains of this infrastructure if you know where to look.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Helen Keller once broke ground on this historic center for the study of technologies to benefit the hearing impaired.

A building shaped like the Army Corps of Engineers logo, because why not?

100 years later, they're still down there.

The only National Monument ever to go missing for nearly 50 years then resurface in a dump.

Before Nixon, "watergate" meant canals.

Senators used to relax in the nearly forgotten marble tubs now hidden in the U.S. Capitol Building's basement.

Architecture lovers won’t stop touching the National Gallery's 19.5 degree marble prow.

The discovery site of the "Capitalsaurus," the official dinosaur of Washington, D.C.

Art deco landmark on the outskirts of Washington, D.C.

A heroic pigeon that, through a barrage of gunfire, delivered a message that saved over 100 lives in World War I.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

Washington's iconic carousel has a nice piece of Civil Rights history.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”