A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

One of the largest trees of its kind in California.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

A hidden courtyard houses early 20th-century plaster masterpieces.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

The building was originally a gas station built to resemble a Japanese tea house.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

The grave of the first dolphin to play Flipper is located at the Dolphin Research Center.

A unique botanical garden housed in three giant geodesic domes.

Built in France in the 1400s, this gothic chapel now resides at Marquette University in Milwaukee, Wisconsin.

A place to eat for on-the-run agents and espionage enthusiasts.

The bugs crawling down the front of this office building are almost as big as a '68 VW Beetle.

Recognized the world over as the home of the McCallisters in the 1990 movie "Home Alone."

Wisconsin's most celebrated export gets the royal treatment on I-94.

Erotic art covers the walls of the largest ancient pleasure palace.

Oversized statues are just the tip of this nostalgic Americana roadside attraction.

This pebble beach is so beautiful that taking its rocks is against the law.

Vikings and Evangelicals have both had a hand in this replica medieval church.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

Walk up a ramp through a forest for panoramic views of Lake Michigan.

This monolithic statue was erected in honor of Chief Black Hawk (even if it wasn't made to look like him).

A historic and oft-filmed prison stands in a Chicago suburb.