Chateau d'Abbadia is a 19th-century castle located on the Basque Coast, in the southwest of France. The castle was designed by the architect Eugène Viollet-le-Duc, and it was built for the naturalist Antoine d'Abbadie and his wife, Virginie. It is considered a masterpiece of neo-Gothic architecture.

The castle is situated on a rocky promontory overlooking the Bay of Biscay, and it has spectacular views of the surrounding coastline. The interior of the castle is decorated with ornate woodwork, stained glass, and sculptures. Visitors can explore the various rooms of the castle, including the library, the music room, and the bedrooms.

The castle also houses a museum dedicated to the life and work of Antoine d'Abbadie, who was a pioneering scientist and explorer. The museum features exhibits on his travels to Ethiopia, his work on astronomy and geography, and his contributions to the study of the Basque language and culture.