Can't help with the bus but if you do a bit of googling you just might be shocked by the number of camps there were across Europe.
Hi, the bus to connect the Rive - seaside of city center - to the Risiera of San Sabba (the nazi lager) is #10.
You get on at the Piazza Tommaseo, near Piazza Unità, then get out at the terminus in Via Valmaura, near the Stadium (around 25 min bus ride). 10 mins walking to arrive at the museum. It's free entrance, look for the opening time. Is not so big but interesting. http://risierasansabba.it/
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