This exhibit allows visitors to wander through the interior of a replica Ice Age glacial cave.

Pluto is still considered a planet in Ithaca, New York.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

The wooden octagon in which Huckleberry Finn and A Connecticut Yankee were born can still be visited in upstate New York.

The little-known final resting place of one of America's greatest writers.