The caves are spectacular and imposing - 1300 steps, about 2 km walk, temperature 9°C. The guided tour took about 1 hour and 15 minutes.
The place is not easy to reach. After getting off the motorway, it's an endless series of roundabouts with a plethora of street signs but confusing directions. Once you get there, the entrance is easy to miss: there's a huge "Bar" sign and a tiny "Grotte di Bossea ticket office" sign.
Overall well worth a day trip.
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