Me and my girlfriend were out tonight to see a spectacle that takes the visitors to the underground passages of the water stream of Aposa. What was once one of the two streams that brought water to the city and allowed a barricade from the enemies. Starting from the Hebraic ghetto, Dante and his bolognian muse took us underneath, explaining some of it history, how it got closed to form the sewage system, the WWII bombardments, it's reconstruction. All in all a really nice trip, it goes by the name of Tra-ghetto and it's a part of Bologna's cultural summer. You can find more information here.

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