Ley Lines and Druids : There's fiction and there is fact.

In 1921, the English archaeologist Alfred Watkins proposed that the menhirs (single, isolated standing stones,)had been deliberately placed to align for miles across the British countryside as part of a linear network of prehistoric monuments he called ley lines.
Watkins found that many of his supposed menhir alignments ran through places containing the syllable ley in their names, such as the villages Amberley, Bowley, and Foxley in his native Herefordshire, and concluded that this may have been the original word for the ancient roads. Accordingly he called his alignments “ley lines” (pronounced “lay”), and the name stuck. The academic community was not convinced.
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Although archaeologists were loath to accept Watkins’ ideas, the hippie movement in the 1960s came to embrace them with a passion. The notion that ley lines had been roads or trading routes was abandoned, and instead they were seen as channels of mystical power.
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Today, New Agers still congregate at stone circles and solitary menhirs in the belief that they can, even now, experience or manipulate this magical power.
 
Who were the Druids. What little we do know comes from Julius Caesar and his accounts.

For a more in depth look at all this read:
Phillips, Graham. Wisdomkeepers of Stonehenge: The Living Libraries and Healers of Megalithic Culture . Inner Traditions/Bear & Company.