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Mammoth Cave, Kentucky

Mammoth Cave

World's longest known cave.
37.2136, -86.1548
Sullivan, Missouri

Meramec Caverns

400 million-year old limestone caverns nestled in the Ozarks served as shelter and a hideout for cultures throughout North American history.
38.2745, -91.1057
Hillsboro, Ohio

The Great Serpent Mound

The largest earthwork effigy in the world.
39.1950, -83.6115
The Crystal King
West Liberty, Ohio

Ohio Caverns

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."
40.2385, -83.6992
Auburn Cord Duesenberg Automobile Museum
Auburn, Indiana

Auburn Cord Duesenberg Automobile Museum

A singular collection of hand-built art deco cars are held in a building with style to match.
41.3558, -85.0575
Mentone Egg
Mentone, Indiana

Mentone Egg

A giant concrete egg marks this Indiana town as the "Egg Basket of the Midwest."
41.1734, -86.0349
Old Courthouse Museum in the Historic Warren County Courthouse, Vicksburg, Mississippi.  Photo by Ken Lund
Vicksburg, Mississippi

Old Courthouse Museum

Museum of the Old South that never was.
32.3525, -90.8782
U.S.S. Cairo - Front/right.
Vicksburg, Mississippi

U.S.S. Cairo

This iron and wood Civil War city-ship was the first vessel to be sunk by a torpedo.
32.3441, -90.8516
Moonlight tower at night
Austin, Texas

Austin Moonlight Towers

Turning night into day in Victorian-era Austin to thwart a serial killer.
30.2717, -97.7452
Sustainable, sun-powered art.
Austin, Texas

Mueller SunFlowers

A grove of colossal man-made flowers that collect the sun's rays to light up the night.
30.3061, -97.7119
Big Sam towers over the Texas interstate at 67-feet. (Leah Caldwell/Atlas Obscura)
Huntsville, Texas

Sam Houston Statue

World's tallest statue of an American hero.
30.6612, -95.5107
Italy, Texas

Starship Pegasus

A starship has landed in Texas, a welcome break for weary travelers from a drab stretch of I-35.
32.1961, -96.8984
The artesian bottling factory that now houses the Dr Pepper Museum.
Waco, Texas

Dr Pepper Museum

Museum in a century-old building dedicated not just to soft drinks, but to the free enterprise system.
31.5551, -97.1294
The Baker Hotel in 2006. (Wikimedia Commons)
Mineral Wells, Texas

The Baker Hotel

Crumbling hotel echoes with the sounds of the '30s.
32.8092, -98.1120
Dublin Dr. Pepper being bottled.
Dublin, Texas

Dublin Bottling Works

This soda factory is one of the last in America to use real cane sugar despite the protestations of Dr. Pepper.
32.0843, -98.3426
Mooresville's Gravity Hill
Mooresville, Indiana

Mooresville's Gravity Hill

This mysterious hill seems to pull objects uphill.
39.6043, -86.4107
Seen here against the backdrop of the Monon Trail bridge, Rainbow Bridge is the main method of transit for cars crossing White River via Broad Ripple Village
Indianapolis, Indiana

Painted Rainbow Bridge

A flamboyantly decorated bridge signals diversity and fellowship at the entry to Indianapolis' Broad Ripple Village.
39.8713, -86.1429
Wall of Champions.
New Castle, Indiana

Indiana Basketball Hall of Fame Museum

Indiana's shrine to the sport that has become a hallmark of their culture.
39.9289, -85.3702
Lincoln Boyhood National Memorial
Lincoln City, Indiana

Lincoln Boyhood National Memorial

The farm where one of America's greatest leaders was raised is now a well appointed landmark.
38.1135, -86.9961
Santa Claus, Indiana

Santa Claus, Indiana

You thought Santa Claus didn't exist, but it turns out, you were wrong.
38.1127, -86.9173
West Baden Springs, Indiana

Historic West Baden Springs Hotel

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.
38.5671, -86.6185
Some call this the rose. It shelters the Lipchitz sculpture.
New Harmony, Indiana

The Roofless Church

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.
38.1314, -87.9350
New Harmony Labyrinth. (Creative Commons)
New Harmony, Indiana

New Harmony Labyrinth

Symbolic attempt to overcome the issues of life.
38.1224, -87.9359
Cave-In-Rock
Cave-In-Rock, Illinois

Cave-In-Rock

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.
37.4686, -88.1558