The highest point in North Carolina and the United States east of the Mississippi River, Mount Mitchell is named after argumentative explorer Elisha Mitchell.

The highest point in the state of New Hampshire, and while unlikely "the worst weather in the world," it sure seems that way to hikers.

This fort down the Potomac from Washington, D.C. was once the only defensive fort protecting the capital.

The house that Frank Lloyd Wright "(shook) out of his sleeve at will" at the age of 86.

The only road through the heart of Glacier National Park.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

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

The world's largest rotating world.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A glittering South Asian anomaly in a wealthy Los Angeles suburb.

Frank Lloyd Wright’s most iconic home dangles over a Pennsylvania waterfall.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

This massive redwood tree has a hole in the base big enough to drive through.

Ten 25-foot-tall, beehive-shaped kilns, abandoned in Death Valley.

Quite simply the largest tree in the world (by volume).

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

A world-class observatory in the California desert.

Where there's quartz, there must be gold. Thus is the story of the mines of Julian, and the titillating times of the Gold Rush.

A house built from trash known as the poor man's Hearst Castle.

"Only the devil could play golf here."

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

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

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.