The sky is the imit

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Across
  1. 2. "nach aussen"
  2. 3. opposite of beautiful
  3. 7. the place where planes start and land
  4. 8. a very expensive stone to build temples etc
  5. 10. He/ she designs and plans buildings
  6. 12. a very high building
  7. 14. "Eisen"
  8. 15. over a river there is a xxx (Golden Gate...)
  9. 19. "sich niederlassen"
  10. 20. many walls are made of xxx
  11. 21. opposite of agree
  12. 23. "Stahl"
Down
  1. 1. Wood and stone etc are xxx
  2. 4. Höchstgrenze, Limit
  3. 5. a plant grows xxx the light
  4. 6. a very hard stone
  5. 9. "erstaunt, verblüfft"
  6. 11. the most of the new buildings are made of xxx
  7. 13. "Herausforderung"
  8. 16. "Mangel"
  9. 17. Ramsen is very near of it - has it
  10. 18. "Meinung"
  11. 22. "zustimmen"