Thomas sisters unite!

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Across
  1. 1. Belizean vacation would begin here
  2. 4. Birthplace of Appachan
  3. 6. The biggest waves in the world are here
  4. 9. There was a fracas in this Venezuela capital
  5. 11. You'd land here to learn about Tut
  6. 12. A wall here fell down in 1990 and ended a war
  7. 13. Three brothers and this sister make up a quad
  8. 14. Animated skinny sidekick of a portly warthog
  9. 15. A university in Washington DC/Guyanese capital
  10. 16. sculptor of "The Thinker"
  11. 17. Capital deep in the Brazilian jungle
  12. 19. Mildly irritating Disney Character and Capital
  13. 20. If you need to study canals in Italy try here
Down
  1. 1. Igniting something and letting it....
  2. 2. enemy of a cobra, known for teeth and speed
  3. 3. High altitude capital of Colombia
  4. 4. Birthplace of Ammachi
  5. 5. City played host to 1992 Summer Olympics
  6. 7. Galapagos Islands are off this country's coast
  7. 8. Audio won't help you in this Uruguayan capital
  8. 10. Anne Frank hid in attic here during the WW2
  9. 18. Champs Elysee and the Rive Gauche