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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