Sightseeing in London

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Across
  1. 3. This place used to be a state prison.
  2. 6. This church is famous for its dome.
  3. 7. This is the place where royalties are married or burried.
Down
  1. 1. It is the first of its kind in the world.
  2. 2. The place where you can see a famous greek monument.
  3. 4. This is where the Queen of England lives.
  4. 5. You can have a 360 degrees view of London from it.