In the 18th century, D.C. city planner Pierre Charles L'Enfant envisioned a mile-long, 400-foot wide "grand avenue" that would be located directly west of the Capitol. Although his exact vision never came to be, the National Mall exists in its place, stretching from the Capitol building to the Lincoln Memorial, with the Washington Monument located almost directly in the center. The open, grassy national park sees around 24 million visitors each year. Its location and size make it ideal for political rallies, marches and other activities, and its status as a park make it a popular spot to jog, picnic and peoplewatch. Many of the nation's most important landmarks lie here — the Reflecting Pool, war memorials, The National Air and Space Museum, The National Gallery of Art and much more.