content: https://www.youtube.com/watch?v=PdantUf5tXg There's a timelapse of it, you pick the time you want it to be. There just were that many people there. The metro ridership is another good indicator: https://www.washingtonpost.com/news/dr-gridlock/wp/2017/01/23/trump-white-house-admits-its-metro-ridership-figures-for-inauguration-day-were-wrong/