One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

A giant scale model giving a sneak peek at what urban planners see for Shanghai by 2020.

The once highest point in China blends symbolic design with a kick of adrenaline.

One of the last functioning antique elevators in Chicago.

Hot Doug's "Hot Dog" Stand.

An enormous park-like oasis, full of famous Chicagoans' graves.

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

Quite simply the largest tree in the world (by volume).

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

This presidential tomb was not dedicated until years after Harding's death due to personal controversy.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

The tragedy of the Japanese internment camps is remembered here by a stark "Soul Consoling Tower."

Part taxidermy workshop, part natural history museum this Michigan destination shows off its dead animals and helps you mount your own.

This monumental Jesus is often referred to as "Our Milk Carton With Arms."

This family driveway also serves as the highest point in Illinois.

The highest point in South Dakota contains the ashes of Valentine McGillycuudy, the "Holy White Man."

In the St. Francois Mountains in the Ozarks at 1,772 feet above sea level, Taum Sauk Mountain is the highest (and possibly oldest) peak in Missouri.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

This erect, phallic geological spire wasn't always named so domestically.

The highest point in Wisconsin is capped by two towers that are not as mythic as Tolkien's but provide much better views.