Castlopedia is a research-driven guide to historic castles and fortifications around the world. Its collection features more than 12,000 sites, with the homepage highlighting a broader worldwide catalogue of castle records. Visitors can explore an interactive map, browse castles by country, and discover information about each site’s history, architecture, location, and cultural significance. Featured entries span diverse eras and regions, from Bled Castle in Slovenia and Himeji Castle in Japan to the Citadel of Carcassonne in France and Kronborg Castle in Denmark.

Beyond its castle directory, Castlopedia publishes articles on subjects such as medieval life, architectural traditions, castle construction, and common historical myths. The site also offers Castle Guesser, invites contributions, and encourages visitors to add favourites, mark places they have visited, and share reviews or comments. Country listings make it easier to explore national collections, while community feedback adds personal perspectives to the historical reference material. Whether planning a visit or simply learning about fortresses across cultures, users can find a combination of educational content, discovery tools, and travel inspiration.