Twenty years ago, as a tourist in Scotland, the wife and I stopped at the Camera Obscura in Edinburgh. Very cool. It was periscope-like — projecting a circular image down onto a circular table beneath. As you panned the periscope around the image too rotated such that you had to work yourself around the table to keep the horizon "level" — relatively speaking.

A few months ago, in Edinburgh again on vacation, and it looks like they turned what was a quaint oddity into a whole "family experience" with all kinds of other things for kids and such. I passed on it this time.