No one knows how many bodies are in this vault in a Chicago public park.

One of the largest trees of its kind in California.

One-of-a-kind preserved ruins of an abandoned 1880s church in Chicago's Pilsen neighborhood.

The oldest operational cathedral in the U.S. has one shell of a way of projecting speakers' voices.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A towering Art Deco movie palace made to look like a Mayan temple.

The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.

This architectural stunner is one of the few surviving Egyptian Revival theaters in the U.S.

The tomb was guarded by soldiers from both sides of the war, and some left their initials carved in the brick.

The original vault that held the president's remains still stands, empty, not far from where he was finally buried.

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

An old California photo stand has been turned into a shrine to the cozy art of crochet.

Explore 10 acres of environmental sculptures.

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 desert ghost town—occupied for only 12 years—was once home to more than 500 silver mines.

Hundreds of trees made from glass bottles make up this forest on Route 66.

Elevated freight railway turned wildly successful urban park.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.

The world’s largest concentrated solar plant generates as many problems as megawatts.

The "Fun Spot of the Desert" is now a haunting ruin, and a reminder that putting a water park in a desert is a bad idea.

This giant temperature attraction created some giant electric bills.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

This abstract sculpture is rumored to cast a hammer-and-sickle shadow once a year.