Climb inside an iron crystal magnified 165 billion times its normal size.

Visit the ancient, mysterious Roman catacombs ... in the Netherlands.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

An intricate and amazing house built by architect Karl Junker.

The "Prussian Versailles" that is as glorious today as when it was built.

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

One of the earliest bowling lanes in the U.S. doubled as a sewing school during a time when women had little job opportunity.

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

This tiny church near Sleepy Hollow contains Henri Matisse's last work, a rose window, and nine windows by Marc Chagall.

"Gnome Chomsky" was once the largest gnome in the world, but is now simply tall for his kind.

This German museum is devoted to all aspects of grave culture from headstones to coffins.

A large circus museum with summer performances.

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

This cave holds a surprisingly colorful variety of geological oddities.

A bizarre house filled with an astounding array of collections.

FDR hoped to find a cure for polio in this Georgia town's warm springs.

The house that Southern rock built now stands as a monument to one of the genre's favorite families.

A stockpile of childhood lunch pails turned collectibles.

A Museum of Holography frozen in 1974.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

An abandoned water sports stadium that has become a haven for graffiti and decay.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.