Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

A wild trout fishery in Arkansas.

The remains of an early 1900s dude ranch that operated until the 1970s.

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

A eclectic collection of military memorabilia.

The second oldest continuously operating bar in Louisiana.

A geological oddity formed by two rivers carving out a mass of limestone on both sides.

The Bucyrus-Erie model 1850B electric shovel, or "Big Brutus," the largest existing electric shovel in the world.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

This one-room schoolhouse in rural Arkansas dates to the 1920s, but looks like it could be the 1820s.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

An extravagant western hotel where every floor is the "ground floor."

One of America's first planned communities is preserved in a state park.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

A restored schoolhouse was once a vital part of the Black mill workers community in Arkansas.

The scant remains of an expansive indigenous civilization can be seen at this Arkansas state park.

This two-room shotgun shack in Tupelo is the birthplace of a King.

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

Step back in time on this preserved 1800s farm.

Walk the whole Mississippi River!

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

The final resting place of New Orleans' most famous voodoo priestess.

The largest source of fossilized insects anywhere.