This is a spectacular site. The site is an incredibly well preserved Eleventh Century structure and the tower has been beautifully restored and includes a very informative tour via high tech tablet with augmented reality. We went there with our kids 8 and 7 and spent some four hours exploring the extensive walls, outsides and tower. The tablets really helped the kids focus and discover medieval life, THOUGH, we did occasionally take the tablets away so they could focus on the physical building.