The "Seinfeld" diner.

An abandoned castle owned and ignored by Masons carries a cursed history.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

A library where thousands of books explain how to avoid another Great Recession.

This institution celebrates the happy accidents of uncommon sticktoitiveness.

A misunderstanding gave this 18th-century racehorse a most amusing name.

Thanks to a spelling mistake this bizarre beaver-tiger hybrid became the symbol of a Siberian town.

A motel dedicated to Southwestern nostalgia.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A spiritual vortex among the red rocks in Sedona.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

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

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

Weighing 30,000 pounds, this monument represents Detroit's first industrial era.

World's largest Christmas store.

Legs Inn provides Polish food, a cornucopia of Odawa artwork, wood carvings, and mounted deer heads.

One of the largest crucifixes in the world stands 55 feet tall in a secluded, wooded area of northern Michigan.

A crumbling hospital from the 1850s on Roosevelt Island.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Visit the monolithic tomb of America's most famous general.

Mysterious 500-year-old tapestries depict a unicorn hunt.