alt Hacker NewsNot sure Stonehenge qualifies as "niche". Anyway ...
If you're ever visiting the Lake District, NW England, I recommend the unexpectedly interesting Pencil Museum in Keswick. Graphite was first mined nearby and when it was realised it could be used for pencils, it became extremely valuable, requiring armed guards for its transportation. Thus Keswick claims to be the birthplace of the modern pencil.
I mainly define "Niche" as "I get to define what Niche is and put things I like on my website".
Stonehenge is probably the most mainstream thing on there, but I don't think most people visiting know to look out for the rooks!