Created by aliens or Merlin (depending on who you ask), what is the name of this famed and highly-visited prehistoric monument?

Located on the Salisbury Plain in England, the prehistoric Stonehenge has long been a mystery to archeologists. The 25-ton stones stand about 13 feet high and seven feet wide and are arranged in an outer ring with horizontal lintel stones running the length of the top. Legend has it that giants built the stones like Legos...others say that they are Roman temple ruins...or did the invading Danes place them to confuse everyone? Who knows?

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