Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

A sealed test tube said to hold Thomas Edison's dying breath was given to the inventor's friend and mentee, Henry Ford.

Berry Gordy Jr.'s old home was the original headquarters of Motown Record Corporation.

The only surviving prototype for Buckminster Fuller's house of the future.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

A Beaux-Arts triumph rises from decades of decay to become the heart of a new innovation district.

A fitting attraction for the corn capital of the world.

A tribute to the twin ideals of religion and patriotism, built by a Catholic priest from rocks, glass, and innumerable found items.

A large circus museum with summer performances.

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

More than 5,000 contemporary and "historic" mustards from around the world.

The house where John Wilkes Booth conspired with his co-conspirators.

Largest Roman Catholic church in North America.

The site of the climactic scene from the classic horror film is now a historic landmark.

The highest point in Washington state is a volcano covered in glaciers.

The semi-reclaimed ruins of this canal were once part of an ambitious plan to reroute the mighty potomac.

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

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

The king of U.S. high points towers over every other peak on the continent.

A geological mystery on Camelback Mountain.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

A spiritual vortex among the red rocks in Sedona.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.