Royston Cave continues to be one of Britain’s most intriguing places. What draws tourists and historians to the cave is that it continues to be a mystery as to who constructed it, when it was made, and why.
However, there are a lot of theories. Esoteric thinkers assert that the cave is situated at the meeting point of two ley lines, ancient passageways thought to connect sites of spiritual significance, one of which, the so-called Michael Line, also passes through Avebury and Stonehenge. The Icknield Way, a historical route that runs along southern England’s chalk escarpment from Norfolk to Wiltshire, and Ermine Street, a Roman road that originally connected London to York, are both highly significant ancient roads. However, the fact that the cave is located directly beneath the intersection of these two highly significant ancient roads makes this claim easier to verify.
Source: https://www.bbc.com/travel/article/20221212-a-secret-site-for-the-knights-templar