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

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

A traveling postal dog covered 48 states and more than 140,000 miles, and he lives on as taxidermy, patched up with a rabbit's foot and a pig's ear.

The most decorated dog of World War I is preserved in the Smithsonian.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

Home to items never before seen by the public.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

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

A former waterfront market is now in the center of town due to some interesting Boston engineering.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A fitting attraction for the corn capital of the world.

A tribute to Ponce de Leon's supposed quest for eternal youth.

A building so large that it has its own weather.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

The site of Paul Revere's historic two lantern warning.

A museum dedicated to the alleged Roswell Incident.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

This replica of the Greek structure is in the heart of Nashville.

Every equinox this Maya pyramid puts on a spooky ancient light show.

China's most famous acrobatics act.

The once highest point in China blends symbolic design with a kick of adrenaline.