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

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

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.

This nondescript tunnel has been featured in a number of iconic movies, from “Roger Rabbit” to “Back to the Future.”

A fake town founded by Western movie stars is now becoming a hip desert community.

A music-filled, booze-soaked oasis in the desert.

On a barren hillside in the Yucca Valley, the recently restored Desert Christ Park has attracted pilgrims and kitsch hunters for over 50 years.

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

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

An off-grid art installation that encourages its visitors to imagine a world without waste.

Version of the French Riviera destroyed by the sea.

The ghostly remains of an accidental sea.

World's largest collection devoted to one fruit.

A hidden courtyard houses early 20th-century plaster masterpieces.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

North America's largest accredited model railroad museum.

Swedish skyscraper with a 90° twist.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The world's largest fire hydrant is supposedly tornado-proof.

An underground magnet for ever-changing street art.

A colorful square marks the heart of the city's LGBTQ community.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The 5.5-mile ring of steel posts around the Capitol Building is one of the largest (and most uniform) of its kind in the world.