This naturally-sourced hot spring is now home to a clothing-optional resort.

Hollowed out cedar log tubs set in an ancient towering forest.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

At high tide this strange footbridge appears to have no purpose whatsoever.

The site of one of the strangest disasters in history—a wave of deadly molasses traveling at 35 mph.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

This museum collects over a century of automobile history including the iconic car from The Muppet Movie.

Week-long festival in the baby food capital of the world.

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

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

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

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Where beautiful signs live on forever.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Dramatic river bend surrounds a natural red-rocked pedestal.

On the Oregon coast there is a natural hole that seems to be draining the sea.

Most-visited and most-photographed slot canyon in the American Southwest.

A psychedelic labyrinth on the San Francisco bay.

A huge musical instrument played by the ocean.