Deep beneath the University of Minnesota, housed in a room 83 feet underground, one of the world's great collections of children's literature lifts the veil on thousands of classics. When you visit, just be sure to wear layers.
"It's cold down here," says my tour guide, Lisa Von Drasek. "It is very cold. Put on that sweater."
Von Drasek is the curator of the Kerlan Collection, which holds more than 100,000 books. And she says there's a reason it's 55 degrees:
"This is the temperature that is perfect for books and paper."