Cities of the world

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Across
  1. 3. Nestled amongst the Fjords, contains the Viking Ship Museum
  2. 6. Hosted the convention which serves as the rules of warfare
  3. 8. Europe's oldest capital & the birthplace of democracy
  4. 12. Christ the Redeemer
  5. 16. Economic hub of the Himalayas,
  6. 18. Totally destroyed in WWII & rebuilt
  7. 19. Has lots of French architecture, despite being in Southeast Asia
  8. 21. Buckingham Palace
Down
  1. 1. Formed by the unification of Buda, Óbuda, & Pest
  2. 2. Birthplace of the Rennaisance & Gucci
  3. 4. Built on a lagoon, relies on
  4. 5. Home to the pyramids of Giza
  5. 7. Built on 14 islands
  6. 9. Holy city of Pilgrimage for Jews, Christians, & Muslims
  7. 10. City where government officials were thrown out of windows (twice!)
  8. 11. The world's biggest city by metropolitan area
  9. 13. One of the oldest cities in the world, known for it's steel
  10. 14. City of many names, old capital of the Byzantine & Ottoman Empires
  11. 15. Has the "Museum of nothing"
  12. 17. The Empire State
  13. 20. Contains 2 sections of the Berlin wall