皇居外苑 (Kōkyo Gaien) is the outer garden of the Imperial Palace in Tokyo, Japan. It features beautiful landscapes, walking paths, and historical sites, making it a popular destination for both locals and tourists. The area is known for its serene atmosphere and well-maintained gardens. Visitors can explore various attractions within 皇居外苑, including the National Museum of Modern Art and the iconic Nijubashi Bridge. The gardens are especially lovely during cherry blossom season, attracting many people who come to enjoy the natural beauty and cultural significance of this historic site.