Anyone of 12 years of age upwards is welcome at ISVAG, larger groups of 20 to 30 people will be split for reasons of safety. And it is absolutely free. It is a good idea to request a visit a while in advance, so that together we can arrange a suitable date. You can apply using this form or by calling: 03 877 28 5503 877 28 55. After recording your request, we will send a confirmation letter with a route description and safety instructions.