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To reduce overcrowding and address other issues, several national parks now require that you book your visit in advance. Jamie Carroll / Shutterstock.com
Americans love their national parks — maybe a little too much. Crowded conditions are overwhelming some of these natural treasures, leading to everything from traffic jams to unsafe conditions for wildlife. The National Park Service has responded to these alarming developments by instituting a system of reservations at some parks. This means you will have to plan your visit in advance.