As the glaciers retreated out of northern Wisconsin, this unique natural wonder was crafted.

A group of artists transformed this desolate city alleyway into an outdoor gallery of street art.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.

A lovely hidden waterfall right off the highway is well worth a stop.

Over thousands of years, this slot canyon was carved out of the bed of an ancient lake.

Five acres of divinely inspired folk art.

This striking art museum holds an amazing series of curiosity cabinets.

The arboretum whose marshy soil sucked up the dreams of housing developers.

A unique botanical garden housed in three giant geodesic domes.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

This cave holds a surprisingly colorful variety of geological oddities.

"World's largest scrap metal sculpture" stands in an outdoor sculpture garden in the middle of Wisconsin.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.

Named for a prominent scout and explorer, this Wyoming state park encompasses a replica of an 1840s trading post, a 19th-century Army outpost, and early 20th-century automobile lodgings.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

At the time of its completion, it was the tallest dam in the world.

The crumbling structure is a rare surviving relic of the area's bygone mining industry.

Devilish landscape, once cinema home to giant alien bugs, now derelict roadside attraction.

A miraculous natural phenomenon known as "the spring that breathes."

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

An architect's childhood fantasy treehouse made real.

One man's ambition created this psychedelic log home.