This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

Sunset-colored dunes of volcanic ash make taking a poor photo impossible.

One of the largest fleets of armored vehicles in the world, sitting out in the California desert.

This lesser known Hearst estate is a fairytale village built from the stolen bones of historic European buildings.

Humboldt's human-powered sculptures race across land and sea for days on end in a wacky quest for dominance.

These cinderblock farmhouses were actually World War II radar stations in disguise.

A lighthouse built to save lives that took quite a few with its treacherous location.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

An art instillation for the sake of "raising vibrations."

A historic dam made famous for its turbines and feature in a Hollywood classic.

This winding road of 318 curves is a must-visit for (careful) motorcycle and sports car enthusiasts.

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

Step back in time on this preserved 1800s farm.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

This Transylvania County city is home to a rare white squirrel population that is descended from an escaped carnival animal.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

This vast kitty-themed collection illustrates the history of human-cat interaction.

This 5-by-6-foot wooden hut is the smallest historic post office in the U.S.

A mysterious monument meant to be a guide into "an Age of Reason" was destroyed after an apparent bombing.

Each summer, the migratory bats living beneath the bypass form "batnadoes" at dusk.