The Smithsonian's National Zoo is a famous zoo in Washington, D.C., operated by the Smithsonian Institution. Unlike Aloha Safari Park in North Carolina, it is a large research and conservation institution with free public admission. Key facts Admission: Free, but every visitor, including infants, needs a free entry pass. National Zoo +1 Location: 3001 Connecticut Avenue NW, Washington, D.C. Current seasonal hours: 8 a.m.–4 p.m.; last entry at 3 p.m. Indoor exhibits generally open at 9 a.m. National Zoo Animals: Giant pandas, elephants, lions, tigers, red pandas, sea lions, reptiles, and many more. Parking: $30 per vehicle when reserved at least a day in advance, or $40 on the day of your visit. National Zoo Time needed: Allow around 2–3 hours, though you can spend longer exploring. Official website Visit the Smithsonian National Zoo · Reserve free entry passes Are you asking about the Smithsonian Zoo's annual revenue, similar to your earlier question about Aloha Safari Park, or are you interested in visiting it?