Are you looking for an activity on a wet and dreary day? Take your time wandering around the interesting displays at Museo Catedralicio Diocesano. There's always an opportunity to learn a thing or two.
When you've finished at this León City Centre museum, why not check out León Cathedral, Convento de San Marcos, and San Isidro Basilica? They're near Museo Catedralicio Diocesano and also popular with tourists.