Yellowstone. Arches. Zion. Carlsbad. Denali. Petrified Forest. Not a national park, but one of my favourites was actually Lava Beds National Monument. Beyond these popular ones, there are so many other great natural landmarks, both protected by designation and not. Then there are the historic or notably cultural areas, like DC or Manhattan. You’re really missing out if you aren’t even aware of how many significant places you have in your country.