Water of undetermined depth has attracted rare fish and cult leaders alike.

The ruins of a resort and casino sit on the banks of this blue hole spring that pumps 70,000 gallons of warm, clear water every minute.

Walk down these stairs to get an underwater view of Switzerland's Lake Zug.

The cheese slicer may be a Norwegian invention, but the biggest ones in the world are found in Sweden.

Where you can hail your favorite fictional commanders-in-chief.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.

The oldest hotel in the world has been operated by the same family for over 1,300 years, even catering to samurai.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

Home to a forest of whimsical pygmy Coast live oak.

The "Mona Lisa" of funerary art.

Visitors to this library are in for a real-world education in modernist architecture.

This giant ice cream cone is the last remaining icon of a Salt Lake City staple.

This is one really big nut.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

148 feet long and in the middle of a verdant forest.

A frozen oasis lies beneath the scorching New Mexico desert.

A creek tumbles over a series of step-like rocks to create this scenic water feature.

This lab's maddening silence is good for business but bad for sanity.

These curious caverns have been home to mushrooms, gangsters, and disco.

A piece of solitude and tranquility in the heart of East Saint Paul.

This vintage "streetcar boat" lay at the bottom of Lake Minnetonka until the 1980s.

This rare vessel mixed luxury with labor before being converted to a museum and sometimes haunted maze.

This 1960s kinetic artwork has been restored and is once again whirling away in downtown Minneapolis.

Journey through the largest remaining peat bogs in the contiguous United States to see the wilderness as it once was.