Also known as "America's attic," for its spectacular collection of nearly 154 million artifacts, the Smithsonian Institution is one of the the world's largest museum complexes and research organizations. The administrative office of the esteemed institution is housed in a magnificent red sandstone 'castle', that also houses a visitor information area and research chambers. Within this building is also the final resting place of the Smithsonian Institution's founder, James Smithson, with his tomb being preserved in the crypt in the north entrance. Apart from the main building, the institution features as many as 17 museums and galleries within its sprawling complex that represent exhibits across the myriad fields of science, history, zoology, and art. Some of the most notable Smithsonian landmarks include the Natural History Museum and the African American Museum.