It is a massive cathedral and inside there is a hole in the roof through which a slowly (but perceptibly) moving spot of light shines illustrating the movement of the earth round the sun and the exact time of the solstices and astrological periods on a huge linear sundial on the marble floor. Arrive shortly before 12:30 (probably 13:30 in the Summer?) and you can follow the spot of light as it crosses the floor to reach its destination. Great for kids and free!
A side chapel also contains a Foucault's pendulum kept in motion by magnets.

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It is free to go into almost all of the museums in Bologna and this one is amazing - due in large part to the work of an 18th century female artist/anatomist who made models to enable medics to study the human body. Some are wax and some are human bone and wax. I would not recommend a visit if you are pregnant - the obstetrics section, although fascinating, could be upsetting: it contains midwife-training models of wombs illustrating difficult foetal presentations, many of which would surely have resulted in infant and/or maternal death.
It also contains (less alarming!) sections on natural history and physics.

Palazzo Poggi

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It's a stylish cafe/bar/cake shop in the centre of Bologna and at around 6pm they put out a mouth-wateringly delicious free buffet. It starts with tempting canapes, and after a bit they bring out warm things. The drinks are not cheap (it was 6 euro for a glass of wine) but as you can eat all you want for the price it is brilliant. It is also fascinating watching the bar staff prepare and serve cocktails with aplomb, and watching the other customers.

Piazza Galvani (web = caffezanarini.com)

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