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

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

The "3rd largest" city in California is an empty mirage of suburbia in the middle of nowhere.

An outdoor sculpture park of giant pink robots and post-apocalyptic Christmas scenes.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

The ghostly remains of an accidental sea.

A hand-built folk art installation covered with messages of God's love.

A monument celebrating the idea of reaching inaccessible places.

Rumor had it that these concrete crosses scattered across the Arizona scrubland helped align spy satellites. (They didn’t.)

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

A cabinet of curious mathematical models and old calculators.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

Ancient pueblos built into the base of a natural canyon wall.

A spiritual vortex among the red rocks in Sedona.

A reproduction of earth's many biomes.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Buy your friend a drink or staple some cash to the wall for the next guy at the Salty Dawg Saloon.

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

A historic freight system that found the true gold rush is in tourism.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

A trading post in the North Pole where children send letters.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

Industrial ruin decimated this tiny New England company town in a fashion no one saw coming… and even fewer remember today.