|The Discovery Center exhibits introduce visitors to the unique geology, flora, fauna, and history of the Columbia River Gorge. Visitors can tour the Ice Age exhibit, which features a life-size mammoth, and see an interpretation of the role that the Ice Age played in populating the Americas. The exhibit explains why everything reached mammoth proportions during the Ice Age, how and why people migrated during this forbidding time, and why Ice Age theories are complex and incomplete. There's also the Lewis and Clark Expedition exhibit. The Corps of Discovery carried 30 tons of supplies and equipment. This exhibit examines why they packed so much, and how difficult it was to transport it all. This is a hands-on exhibit.