The USA tourist attractions

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Across
  1. 3. That's a dizzying 1,220 meters...
  2. 4. The walkway and railings are made out of...
  3. 6. National Air and Space...
  4. 7. Ten ....., one river
  5. 8. Color of the presidents house
  6. 10. The capital of the USA (.... D.C.)
Down
  1. 1. Don't go to the Grand Canyon if you're scared of..
  2. 2. The state the Mississippi river ends at
  3. 5. Tower of...?
  4. 6. The state with one of the longest rivers
  5. 9. New York is a...