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

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

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

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

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

This historic Victorian hotel has a scandalous history of affairs and murder.

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

The only road through the heart of Glacier National Park.

Historic site where Native American hunters once trapped and killed buffalo.

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

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

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

It would be easy to walk past this unusual piece of art and have no idea it pays tribute to the odd life of a real chicken.

A sprawling collection of over 106,000 toys from around the world.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

These aggressively sustainable art homes look like something out of 1970's science fiction.

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.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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 cave's rare beauty held a cavernous secret hidden underground.