The secrets of ancient buildings

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Across
  1. 4. a building used for religious practices or occasionally similarly organized activities
  2. 5. a building comissioned by Marcus Agrippa
  3. 6. the dynasty during which gunpowder became available
  4. 8. one of the most common plant forms to make foliage ornament and decoration
  5. 10. the most durable material used in the Great Wall of China
  6. 12. an element of architecture that resembles the hollow upper half of a sphere
Down
  1. 1. used to drag the blocks of pyramid into position
  2. 2. the Roman concrete's key ingridient
  3. 3. in Greek religion and mythology it is the goddess of wisdom, courage, inspiration etc
  4. 7. a central opening to the sky
  5. 9. a repository for the remains of the dead
  6. 11. one of the material used in building the statue of Athena