Natural: 1. Colorado River Canyon, 2. Mojave Desert, 3. Mammoth Cave, 4. Yellowstone National Park, 5. Everglades Marshes, 6. Sequoia National Park, 7. Niagara Falls, 8. Lake Superior, 9. Bedlands of the Great Plains 10. Great Salt Lake 11. Death Valley.
The most interesting in their historical formation, the most unusual in their beauty objects, are very popular with tourists
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.