Also known as the Osaka Garden, this garden was originally built in 1893 as part of the World's Columbian Exposition.

One of Chicago's last seafood smokehouses perfects a dying breed of fishcraft.

The oldest experimental corn field in America is still creating better ways to grow crops.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

After the comedian dissed a Connecticut town on his show, they named a sewage treatment plant after him.

For over a century, it has been a tradition to raise a flag at the top of this 450-foot sandstone pillar on the 4th of July.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

Ancient pueblos built into the base of a natural canyon wall.

See massive fossils that are over 200 million years old in northeastern Arizona.

A gift from Japan, 17th-century lantern stands among the cherry trees at D.C.'s Tidal Basin.

The hippo that stands on this university campus was once a drunken flea market purchase.

The only Leonardo Da Vinci painting in the Western Hemisphere.

The final residence of an educator, civil rights leader, and presidential advisor was also the first headquarters of the National Council of Negro Women.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.

Corn-inthian columns with a uniquely American take on neoclassical architecture.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

Members of Congress have traveled between the buildings on Capitol Hill for a century hidden from tourists, press, and storm clouds.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The "lovely red Vega" of the legendary record-settling pilot.

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

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.