This cave holds a surprisingly colorful variety of geological oddities.

More than 5,000 contemporary and "historic" mustards from around the world.

The world's longest known cave system.

One of the few surviving "Wigwam"-themed motels.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

This historic train station has been converted to a locomotive themed hotel.

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

This lagomorph-obsessed Route 66 emporium is home to a giant jackrabbit that sits in a bunny graveyard.

The fastest mail service in the west is tracked and memorialized along this 1,400 mile trail.

The first home of the doomed aviatrix Amelia Earhart.

143 feet of leaping muskie whose mouth can be used as a wedding venue.

The highest point in Wisconsin is capped by two towers that are not as mythic as Tolkien's but provide much better views.

An oddly poignant roadside attraction celebrating American folklore.

Statue dedicated to the star of an old television show.

This historic Illinois "Muffler Man" has been converted from axe-touting lumberjack to rocket-wielding space ace.

The world's largest covered wagon is piloted by a giant Lincoln lawyer.

While he no longer has an eatery to give him context, this off-brand Paul Bunyan still holds his giant hot dog with pride.

The smallest post office in the United States is no bigger than a broom closet.

An idyllic swimming pool tells the tale of Hemingway's trouble with women.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A monument celebrating the idea of reaching inaccessible places.