Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

A quirky roadside sign was the subject of a years-long legal standoff over highway right-of-way clearances. 

This abandoned mine offers a glimpse at what life was like for those who came to Alaska seeking Gold Rush riches.

An Alaska livestock farm devotes itself to harvesting wool from creatures that once ran with mammoths and sabertooth tigers.

This popular fishing spot at the outflow of a 4.5-mile long hydroelectric tunnel sports a jetty literally made out of classic cars.

Considered by many to be one of the most dangerous highways in Alaska.

Colorful boxes placed over the dead are left to rot and crumble.

A giant statue perched on dumpsters watches over the freeway.

At the edge of the high desert, California's second-largest natural lake is home to a unique subspecies of trout adapted to its alkaline waters.

A statue commemorate Tommie Smith and John Carlos's brave protest at the 1968 Olympics, a watershed moment for civil rights.

This old-world mansion with lush gardens is a gem in the heart of Silicon Valley.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

Decades of discarded bottle caps line this alleyway, a fixture of Texas A&M.

The Iowa state contender for largest pan in the world oddly only comes in second or so.

A pop-culture attraction outside of Dyersville, Iowa, hits a home run.

Hidden in the grounds of the Fort Dodge Museum is a "real" and terrifying petrified giant.

A giant pair of thick black glasses mark the tragic demise of a trio of rock and roll legends.

One of the largest Marian shrines on the West Coast stands rather unexpectedly in Silicon Valley.

Chilly air billows out from the entrance of an abandoned mine on a steep hillside, providing a refuge for Ice Age fauna and flora.

This water tower has been a staple of the Rochester skyline since 1931.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

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.

Hopeless romantics will swoon over the sweet story behind this bright and colorful home.

This restaurant's marvelous musical machines include a self-playing violin.