The world's largest version of this iconic puzzle cube is located in Knoxville, Tennessee.

The world's longest known cave system.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.

A scenic fort on the harbor protected Philadelphia from an attack that never came.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

The world's largest rotating world.

Maine's oldest diner also happens to win acclaim for its elevated comfort food.

Once the future of underwater combat, this old sub is now open for visitors to muck around in.

Friction between grains of sand cause a curious "singing" sound.

This museum shines a light on the true Pilgrim experience in North America.

Since 1947, this living history museum has been providing an immersive look at life in Plymouth Colony.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.