Architectural wonders of U.S.

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Across
  1. 3. Famous Victorian hotel in San Diego.
  2. 5. Monument in Washington, D.C., dedicated to the 16th president.
  3. 7. Tallest building in the U.S., in New York City.
  4. 8. Concert hall in Los Angeles with a sail-like design.
  5. 9. Frank Lloyd Wright-designed museum in New York City.
  6. 10. Residence and office of the U.S. President.
  7. 12. Arch in St. Louis known as the "Gateway to the West."
Down
  1. 1. Headquarters of the U.S. Department of Defense.
  2. 2. National memorial with carvings of four U.S. presidents.
  3. 4. Formerly known as the Sears Tower, in Chicago.
  4. 6. Famous suspension bridge in San Francisco.
  5. 11. Iconic skyscraper in New York City, completed in 1931.