Byron R. Sherman House, Historic mansion in White Sulphur Springs, Montana, US.

The Byron R. Sherman House, known as The Castle, is a two-story granite mansion on a raised basement atop a hill above White Sulphur Springs. Its plan is roughly 40 by 40 feet, with two full-height towers added on the south side. The NRHP nomination calls its heavily rusticated stone, with the east facade laid in field stone, a fine frontier rendition of the late 19th-century Romanesque style. A carriage house stands on the property.

The Byron R. Sherman House was added to the National Register of Historic Places on September 15, 1977. Its NRHP nomination describes it as a fine frontier rendition of the late 19th-century Romanesque Style, with heavily rusticated stone and an east facade laid up in field stone. The property includes a carriage house, and the Castle Museum is operated by the Meagher County Historical Society.

The Castle Museum is run by the Meagher County Historical Society, which displays period furniture, photographs, mineral samples, clothing and artifacts from the region's past inside the granite mansion. The property also includes a carriage house.

The house stands on a hilltop above White Sulphur Springs, so it can be seen from much of the town. The property also includes a carriage house. The Castle Museum is operated by the Meagher County Historical Society.

The property includes a separate carriage house, and the museum is run by the Meagher County Historical Society. Its collection brings together period furniture, photographs, mineral samples, clothing and artifacts from the region's past.