Travel through the hidden underbelly of the city in colorful tunnels filled with art and history exhibits.

Built from oil field parts and resembling a teepee, this abandoned mid-century church is hoping for a comeback.

Nature's biggest mammal swims in landlocked Oklahoma.

The fifth tallest statue in the United States is a shirtless monument to the oil worker.

These massive mitts are made of 30 tons of devotional bronze.

This former mining town was named the most toxic town in America.

The modest childhood home where the baseball legend and Yankees star learned to hit from both sides of the plate.

An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

The grand marquee of this abandoned Hawaiian theater remembers the building's elegant past.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

This Hawaiian cattle ranch acts as a museum devoted to the island cowboys that predate the wild west.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

This black shoreline is made up of exploded lava particles.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

Dozens of feral felines rule a segment of Hollywood's only graveyard.

Since 1973, this block has been home to the most concentrated collection of murals in San Francisco.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A modest reminder of treacherous waters at the Golden Gate.