Nature Museum is located in Carriage House and features a variety of exhibits. The museum features a learning environment and provides educational opportunities. It has a collection of butterfly and moth eggs, rocks, minerals, fossils, seashells, games and habitat dioramas. Nature Museum serves various students and visitors. The museum is a part of the Cylburn Arboretum Association, which is a nonprofit organization that has more than 140 volunteers. Also known as CAA, the organization maintains gardens and trails in Baltimore. It sponsors cultural and fundraising events, such as Market Day and Chamber Music Series for children and adults. The Cylburn Arboretum Association has rooms that host meetings, receptions and workshops.