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This castle was a frequent target for ninja attacks in the old days. Resist the temptation to slip on a mask and go skulking around as if nobody can see you; the sleepy guard inside the castle doesn't need the hassle. It's one of the better-looking castle reconstructions in Japan, but the museum inside is not really worth a visit.
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芭蕉翁記念館
This museum pays tribute to the haiku master Matsuo Bashō, who is thought to have been born in Iga. It's not often open, but the building itself, shaped like the hat Bashō wore, is a curious sight.
伊賀忍者博物館
Ueno's top attraction by far, this old Japanese house was actually used by the Iga clan and is full of spiffy ninja secrets like trapdoors, revolving walls and more, all demonstrated by kunoichi - cheerful lady ninjas in pink garb. There is a museum on the grounds with good English displays, and there are also live demonstrations of ninja weaponry and techniques - hourly from 11:00 to 15:00 except Tuesdays (only weekends in Dec-Feb).