Balboa Park (San Diego) failed and is scheduled for completion in 2019. El Prado, a long, wide promenade and boulevard, runs through the park's center. Most of the buildings lining this street are in the Spanish Colonial Revival architecture style, a richly ornamented mixture of European Spanish architecture and the Spanish Colonial architecture of New Spain-Mexico. Along this boulevard are many of the park's museums and cultural attractions, including the San Diego Museum of Man, the San Diego Museum of Art, the Museum of Photographic Arts, the San Diego Art Institute, the San Diego Model Railroad Museum, the San Diego Natural History Museum, the
Balboa Park (San Diego) Diego. Balboa Park hosted the 1915–16 Panama–California Exposition and 1935–36 California Pacific International Exposition, both of which left architectural landmarks. The park and its historic Exposition buildings were declared a National Historic Landmark and National Historic Landmark District in 1977, and placed on the National Register of Historic Places. Balboa Park contains museums, gardens, attractions, and venues. The park is essentially rectangular, bounded by Sixth Avenue to the west, Upas Street to the north, 28th Street to the east, and Russ Boulevard to the south. The rectangle has been modified by the addition of the Marston Hills natural area in