The "best" time to visit the National Mall in Washington, D.C., depends on your goal, but for the most atmospheric and comfortable experience, sunset and nighttime are the winners. As evening falls, the crowds of school groups and tourists thin out, the temperature drops, and the monuments—including the Lincoln Memorial, Washington Monument, and World War II Memorial—are beautifully illuminated against the dark sky. This provides a somber and majestic environment that is perfect for photography and reflection. If your goal is to visit the Smithsonians and other museums along the Mall, you should arrive at "Rope Drop" (typically 10:00 AM) to be first in line, as these institutions are only open during the day. For a balance of both, an early morning walk at sunrise offers a serene, golden-hour view with very few people around, followed by being ready for the museum openings. Avoid the mid-afternoon (1:00 PM to 4:00 PM) during the summer, as the Mall is a vast "urban heat island" with very little shade between the iconic landmarks.