There are quite interesting Wikipedia articles to read on the smart phone for the objects surrounding one. There is not an explanation for all sites, but it’s quite impressive, what contributors have created.
But of course hearing the story from a local guide is more personal and individual. So, like in other places, I took a guided city tour through Rostock. Luckily, the weather was quite nice – as most of the time on my trips – but also quite cool. It was not a bad idea, to use the hat and gloves.
One of the most interesting features, I saw on this tour was an astronomical watch within the St. Marienkirche. It does not only show time and the current date, but it also shows moon phases, and features an “endless” calendar, where one can identify the day of week for any year or the date of easter etc.