An architect's childhood fantasy treehouse made real.

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

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

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

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

A beautiful geyser under environmental threat.

A starship has landed in Texas, a welcome break for weary travelers from a drab stretch of I-35.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

One of the longest water bridges in the world was built over a supposedly haunted swamp in Louisiana.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The record holder for the world’s largest peach.

An acoustic anomaly with a mysterious cause sits in the heart of Tulsa.

An abandoned factory along the Mississippi coated by a giant mural.

The site where Confederate president Jefferson Davis was defeated has been marked with a bust... that leaves that part out.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

Native Americans built this circle of stones, which was used to predict astronomical events.

A waterfall 600 ft. inside a mountain, once the bane of gold miners, is now a spectacle of nature.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

One of America's first dinosaur parks gives a window into Depression-era paleontology.

The humble beginnings of the man known for his lavish "champagne" music.

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

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Live long and prosper in Tennessee.