A monument commemorating the role of Alaska's native Tlingit guides in the Klondike Gold Rush.

The vanishing remains of an old water station from the late 19th century.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

Its vast collection details the history of this Santa Barbara beach town.

The only surviving 19th-century water-powered mill found in the Washington, D.C. area.

The tennis legend used this racket while breaking the race barrier and becoming the first Black man to win the US Open.

"The only replacement for a DC-3 is another DC-3."

This statue of the "father of television" stands prominently in the United States Capitol.

The only tennis court that falls under the jurisdiction of the central bank.

These unusual rooms on wheels are holdovers from the 1960s.

This fully intact Neoclassical-Greek Revival style firehouse operated until 1938.

From silent movie theater to rock &roll palace and beyond.

View the California coastline (and the home of Barbara Streisand) inch by inch with stunning, government-sanctioned aerial photography.

It took years to decode its mysterious messages.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

A Community Cornerstone.

Don't bother sending any mail to this ghost town.

Impressive artifacts from Juneau's gold mining days fill this mining site-turned-museum.

The tunnel under the Capitol Building where Congress takes out its trash.

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

Thousands of turbines whir at at the origin of North American wind power.

Though the case is scorched and the buttons half-melted, this hardy handheld gaming device can still run a game of Tetris.

FDR's Art Deco hospital tower was hopelessly inefficient.

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.