Take a drunken tour inside the world's largest known geode.

The world's largest piece of copyrighted artwork.

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

This ancient settlement contains some of the largest earthen mounds in North America.

A large stone map of Arkansas awaits visitors to its highest point.

The highest point in Mississippi is a hilltop that was once used to bombard a nearby town with artillery.

This quirky Arkansas wax museum does not shy away from the macabre and the grotesque.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

The highest point in Louisiana, Driskill Mountain at 535 feet above sea level.

This historic general store still operates much as it did in the late 1800s.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

The highest point in Alabama was almost completely deforested, but is now home to protected towers and trees.

The smallest covered bridge in Maryland.

Washed out by the Johnstown Flood in 1889, the surviving portion of the original two-span bridge now resides at Fishing Creek.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

This advertisement for talcum powder was painted on the rock face and has since defied removal.

The longest covered bridge in Delaware.

An abandoned gun-funded 19th century utopia.

Now home to hardy plants, these sand and gravel dunes once held back a massive prehistoric lake.

The ancient past meets the retro-future at these dinosaur tracks that are protected by a geodesic dome.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The schoolhouse where Jesse Merwin, the inspiration for the "The Legend of Sleepy Hollow" character, once taught.

At this farm in upstate New York, the former president plotted his reelection campaign.

The story behind the mysterious symbol painted in front of the historic university's famous Rotunda.