The museum's interior includes beautiful and original oak woodwork, plaster wall ornamentation and ceramic tile floors.

In July 2000, the museum reopened with several new features, including a handicapped accessible north entrance, elevator and public restrooms.

New exhibits included Exploring the Waterways: The LaSalle Expedition, Nature of Elgin and a hands-on Children's Discovery Room.

Current exhibit topics include Mazon Creek fossils, Native American lifeways, Ice Age mammals, the Fox River ecosystem, the La Salle Expeditions, endangered species, rocks and minerals, and many mounts and natural history specimens featuring wildlife native to the Fox River Valley.

The museum also features a Discovery Room, an interactive and educational playroom directed at children that includes games and puzzles as well as a hands-on collection with furs, turtle shells, and other natural history objects.