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.

In Grand Rapids, Michigan, a marker honors the creation story of a proud fictional culture.

On the right bank of the Grand River a plaque remembers an imaginary painter who once awaited his youth.

Where most of the world's flypaper was made.

At Fountain and Division, in the shadow of Kendall College of Art and Design, lays the story of a fictional culture whose political system was used under license and who finally rebelled.

Outside Grand Valley State University, you'll find a bench upon which many were said to have sat according to the fictional Kcymaerxthaere, waiting for a guide of time.

This former stomping grounds of the most eminent astronomers of the early 20th century.

One of the largest crucifixes in the world stands 55 feet tall in a secluded, wooded area of northern Michigan.

Known as the "Cross At The Crossroads," this massive metal cross is just short enough to avoid the FAA.

The unluckiest U-boat in the entire German fleet is now on display in a Chicago museum.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The highest point in Tennessee, Clingmans Dome bears witness to the ravages of one type of insect.

An angular maze of concrete in Grand Rapids acts both as public art and as a staircase for fish traveling upstream.

In this relatively flat state the highest point is an honored place.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

A giant Troll lurks under one of Seattle's oldest bridges.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The highest point in Texas is capped by a big silver pyramid.

This rural community has attracted both scientists and techno-refugees due to its federally-mandated lack of technology.

Near-constant high winds deform the trees on Spruce Knob, the highest point in West Virginia.