Clothing is optional at nude beaches. Some beaches have been clothes free beyond living memory, and their status has been formalised by becoming official nude beaches, while others, though not official, have become unofficial nude beaches through toleration by local authorities. In some European countries, such as Denmark, all beaches are clothing optional, while in others like Germany there are naturist sunbathing areas in public parks, e.g., in Munich and Berlin. Beaches in some holiday destinations, such as Crete, are also by default clothing-optional, except perhaps central urban beaches. But in Barcelona, naturists can enjoy two beaches even at the central location. A feature of bathing on a nude beach is the anonymity it offers, where membership of a club is not required with detailed application processes, nor pre-booking of visits.