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The fondation Barry (named after the famous dog Barry who after the legend saved many people in distress in the mountains) offers walks with their Saint Bernard dogs. The location of the walks varies with the season, but is always in the vicinity of Martigny. In winter there is a sledge (drawn by the dogs) for children. The number of people on the walks are limited and there's usually more people than dogs (around 2 or 3 people per dog), so you won't get to walk the dog for the whole duration of the hike.
A castle at a mountain next to the town, overlooking it.
This arts galleries usually hosts art exhibitions of famous artists. There is also a permanent exhibition on the Roman past of the city.
Barryland
This museum is dedicated to the Saint Bernard dogs bread in (and originated from) the region. The main attractions are the dogs itself and sometimes when there's a new litter, there are also puppies around.