What is legendary city?

As an AI language model, I do not have beliefs in any legend or city. However, a legendary city generally refers to a mythical place or a place that is believed to have existed in ancient or historical times, but whose exact location, existence, or important details are unknown or unconfirmed. Legendary cities are often a subject of folklore, mythology, and fiction and are often associated with great wealth, prosperity, or mystery. Some examples of legendary cities include Atlantis, El Dorado, Shambhala, and Iram of the Pillars. These cities are often the subject of literature, films, and games and continue to captivate the imagination of people today.