National ZooFree: All time

The National Zoological Park (or the National Zoo) is a part of the Smithsonian Institution and is one of the oldest zoos in the United States. Today, the zoo contains 2,000 animals or 400 different species.  The most popular residences are probably the giant pandas Mei Xiang and Tian Tian, who successfully had a male cub, named Tai Shan.

Address: 3001 Connecticut Ave NW, Washington, DC 20008
Opening hours: Daily 6am – 8pm (summer); 6am – 6pm (winter)
Direction: Metro Red Line to Woodley Park/Zoo/Adams Morgan Station or Cleveland Park Station
Phone: +1 (202) 633-2614

Photo credit:  Ann Batdorf/Smithsonian’s National Zoo