Budapest Zoo is Now Open 25 Jun 2021 4:35 PM From Budapest Zoo: "We can only let our visitors in if they have an immunity certificate or the Hungarian EESZT application. The Hungarian immunity certificate may contain the number of the identity card and / or the passport number. Be sure to bring the document shown on your immunity certificate. If both the identity card and the passport number are on the immunity certificate, you only need to show one of them. We CANNOT accept driving license, because its number is not shown on the immunity certificate. You can enter the area of the Budapest Zoo and Botanical Garden or Margaret Island Zoo if your immunity certificate is valid!