One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A Swedenborgian glass church surrounded by redwoods sits perched atop a massive landslide area.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

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

The first declared National Monument in the United States.

America's "second most important bell" is a contentious spoil of the Civil War.

"the sweltering inhabitants of Charleston and New Orleans, of Madras and Bombay and Calcutta, drink at my well . . . The pure Walden water is mingled with the sacred water of the Ganges."

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

A 60-room castle constructed by a horse-racing heir.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

An Iowa town celebrates its heritage with the tallest working Dutch windmill in North America.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

See massive fossils that are over 200 million years old in northeastern Arizona.

No two pieces are exactly the same at Portland's hippo-themed hardware store.

The magic's in the hole!

A surviving remnant of the thick ice mass that once mantled most of Western Canada's mountains.

Few other hotels can rival the grandeur of the Castle in the Rockies.