Non-astronomy Tuesday

Sticking with the theme here: Lake Superior has frozen enough to allow access to the ice caves at the Apostle Islands National Lakeshore in Wisconsin. These photos, by Barbara Alwes, are from the Wisconsin Department of Natural Resources photostream on Flickr. (via Colossal, where there are many more photos.)

Beautiful as they are, somehow I'm not tempted to jump on a plane and go see them in person.