A miniature train-ride through Slovenia's largest cave system.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

More than a century old, this trading post resides in the Navajo Nation.

This tribute to a local man towers within a quaint lakeside park.

This experiment in the lifespan of seeds will take a century before it is complete.

These gardens recreate unique and endangered Michigan habitats.

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

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

Over 60 chemical plants and oil refineries sit in a 15-mile-wide section outside town.

The world’s largest Masonic temple was saved by the White Stripes.

View the California coastline (and the home of Barbara Streisand) inch by inch with stunning, government-sanctioned aerial photography.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The highest bridge in America was built for an almost unnervingly small amount of money.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.