Sorin Mansion, also known as Tha Rae Ancient House, in Sakon Nakhon Province, is a two-story colonial-style building blending French and Vietnamese architectural styles. It stands out for its ancient construction techniques, using bricks mixed with lime, tree resin, and sugarcane syrup, all without any steel frame. Its signature arched doorways and windows reflect the history and Christian settlement of the Tha Rae community, a heritage spanning over a century.