nytimes July 9, 2021 1:00am How Crowded Are America’s National Parks? See for Yourself. #nationalparksmonumentsandseashores #travelandvacations #independencedayusjuly4 #coronavirusreopenings #acadianationalparkme #grandcanyonnationalpark #joshuatreenationalparkcalif #yellowstonenationalpark #news How Crowded Are America’s National Parks? See for Yourself. Americans are flocking to national parks in record numbers, in many cases leading to long lines and overcrowded facilities. Here’s what four parks looked like over the holiday weekend.