Hidden castles are often ancient structures that are not easily visible or accessible to the public. These castles may be tucked away in dense forests, atop remote hills, or concealed by natural landscapes. Many of them have rich histories, serving as fortresses or noble residences during medieval times. Explorers and historians are drawn to these hidden gems, as they can provide insights into the architectural styles and cultural practices of their eras. Some hidden castles, like those in Scotland or Germany, have become popular among adventurers seeking to uncover the mysteries of the past.