Lemon Grove, California is known for its giant lemon...and mummified bodies.

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

The oldest standing structure in downtown San Diego.

One man's quest for the ultimate road trip vehicle.

The lead horse on a Disneyland merry-go-round that is older than the park itself.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

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

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

The remains of Martha, the last known passenger pigeon, serve as a tool to educate about conservation.

The 28,000-year-old specimen is remarkably intact.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

A muscular Art Deco monument represents the struggle between regulators and unbridled markets.

An echo chamber with a waterfall wrapped around its base at the Embassy of Canada in Washington, D.C.

A spectacular tribute to statesman and philanthropist Andrew Mellon.

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

The national park was once a plantation estate.

At 207 feet, one of the world's longest continuous escalators.

Outside the Department of Transportation, a collection of artifacts honors the history of how we get around.

This statue of one of baseball’s greatest pitchers looks like something out of a sci-fi horror movie.