Capital cities

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Across
  1. 2. The white house.
  2. 6. Biggest standing wall in the world.
  3. 7. Owner of the most emblematic amphitheater (coliseum).
  4. 8. Eifel Tower.
Down
  1. 1. Contains the rests of one the most iconical wall during the cold war.
  2. 3. Biggest skyscraper in latin america.
  3. 4. Emblematic 67m white obelisk.
  4. 5. Owner of the Big Ben.