'This Is Spinal Tap' - 'Stonehenge'
Stonehenge is a mystical arcane locale full of dead spirits and ancient kings and pagan witches who did a bunch of mysterious stuff and left their magics around for thousands of years even though they've (unwisely) built condos all around it. It is a popular tourist attraction despite the number of odd powers and curses that each and every visitor is encumbered with for life.
Nobody knows how it was made but people have a lot of theories and won't shut up about it. Oddly (which is appropriate) time-travel historians have never bothered to look into this origin, and when asked they responded 'it's no Easter Island'.
This may have to do with the fact that British things are inherently boring.