You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

Watch the newest land on the planet form before your eyes.

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

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The rocks in this arid basin leave trails of movement behind them.

This desert oddity hides in plain sight thanks to a cartographic error and a desert explorer with a punny sense of humor.

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

This giant temperature attraction created some giant electric bills.

A former utopian healing center created by a huckster and built by derelicts.

A little sculpture with a large wardrobe.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The remote resting place of a notorious Wild West outlaw whose death is shrouded in mystery.

A crew of die-hard train buffs spent decades turning a defunct stretch of railway in Oklahoma City into a museum now home to over 50 antique and restored trains.

A comprehensive collection of toy and model trains, largely from the mid-20th century.

Under the shadow of its towering parent tree, a rare specimen of sequoia produces ghostly white leaves.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

An emerald-green grotto just a short trip from Austin.

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

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

Though his role as the inventor of baseball may be up for debate, fans still festoon Doubleday's grave with baseballs.

This Maine bridge may be the last wire-supported bridge of its type in the world.

Steam engines and conveyor belts are remnants of a genius system left in the middle of the Maine woods.

A giant telephone commemorates the last "crank" call ever made in the U.S.