IoM[2] - Camera Obscura

One of the features of Douglas Head - This green and white building, as indicated, is a "Camera Obscura" ...
The other item to the left is the lantern belonging to Douglas Head lighthouse

I haven't yet managed to get in this one, but I did visit the one on Clifton Downs, Bristol, a number of times in my youth.
en.wikipedia.org/wiki/Clifton_Observatory
I thin that they are an interesting, if limited, technology, much favoured by artists and the Victorians, sadly there are only a few still surviving.

There is an extensive explanatory item here :- en.wikipedia.org/wiki/Camera_obscura