Smithsonian Institution Libraries maintains more than 20 divisions and a collection of over 1 million volumes with nearly 40,000 rare books. The library has been in existence for more than 40 years. It works with a team of over 100 staff members. The Smithsonian Institution Libraries additionally maintains a Book Conservation Laboratory and an imaging center. The library hosts exhibitions, lectures and tours. It maintains a collection of books related to various topics, such as the history of science and technology, anthropology, African and Asian art, aviation and space exploration, botany and horticulture, and decorative arts and design. It is a part of Smithsonian Institution, which is one of the leading museum complex and research organization that is composed of over 15 museums, nearly five research centers and National Zoo. Smithsonian Institution Libraries maintains a location in Washington, D.C.