Analysis of Written at Stonehenge

Thou noblest monument of Albion's isle!
   Whether by Merlin's aid, from Scythia's shore,
   To Amber's fatal plain Pendragon bore,
   Huge frame of giant-hands, the mighty pile
   T' entomb his Britons slain by Hengist's guile:
   Or Druid priests, sprinkled with human gore,
   Taught 'mid thy massy maze their mystic lore:
   Or Danish chiefs, enrich'd with savage spoil,
   To Victory's idol vast, an unhewn shrine,
  Rear'd the rude heap: or, in thy hallow'd round,
  Repose the kings of Brutus' genuine line;
  Or here those kings in solemn state were crown'd:
  Studious to trace thy wondrous origine,
  We muse on many an ancient tale renown'd.