National parks are the closest thing the planet has to greatest-hits albums. This directory groups the world's most-visited parks by country and lets you filter by season, family-friendliness and what's closest to you right now.
Many big parks now require advance bookings in peak season — check before you drive.
Bears, bison, big cats — these are not zoo animals. Keep distance, store food correctly.
Closures for fire, flood and wildlife are common. Check the park website the day you go.
Pack it in, pack it out. Even fruit peel takes years to decompose at altitude.