The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

An architect's childhood fantasy treehouse made real.

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

One man's ambition created this psychedelic log home.

This sandstone mansion was the home of two of Oregon's most important pioneers.

Community bookshelf of 25-foot-tall book spines.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The Magic House provides a beautiful and creative environment for curious youngsters to get their knowledge on.

What was once a presidential estate is now an exotic menagerie and home to the Budweiser Clydesdales.

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

Portlandia is the second-largest copper repoussé statue in the United States.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

One woman's Viking Castle on Lake Tahoe.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.

Elevated freight railway turned wildly successful urban park.

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.

It was once the base for a series of domestic terror attacks.