A Museum of Holography frozen in 1974.

A century-old network of freight tunnels underneath the city's historic business district.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

Over 1,000 pieces of one of the most niche art objects imaginable: the glass paperweight.

A gothic church spire sits atop this skyscraper, the tallest church in the world.

Hidden on the 7th floor of a historic building, this Cajun spot features wall-to-wall bottles of hot sauce.

Hidden amid the old-world charm of Savannah is a museum dedicated to the world of oddities and criminal history.

This museum is a full-size replica of an original church constructed during the 13th-century.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.

These abandoned grain silos and tunnels are an urban exploration dream.

This museum of miniature displays provides a journey through early American history.

This stunning gothic ruin was a casualty of the Indiana steel industry crash.

This candy shop has been serving up sweets to the Louisville area since the 1850s.

A whimsical folk art garden full of punny pieces and a diorama containing 3,500 toys.

The world's longest known cave system.

The highest point in Virginia can only be reached by passing through ponies and flowers.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

This stunning home looks like it belongs in medieval Europe, not North Carolina.

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

Mysterious ancient boulder carved with petroglyphs in the mountains of Western North Carolina.

This vast kitty-themed collection illustrates the history of human-cat interaction.

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

The scant remains of this flooded historic village can be explored in one of the most remote areas of the Great Smokies.

Wild lights and sound effects turn a walk through some caves into an eye-popping 1960s tourist attraction.