Mason's House, Cultural heritage building in Minsk, Belarus.

Mason's House is a three-storey rectangular stone building under a hipped roof, built in the classical style. Three of its facades have shallow projections topped by triangular pediments with semicircular windows in the tympana. The first floor is separated by mouldings and a band of dentils, while the second-floor windows have surrounds with keystones and triangular hood moulds; small Doric columns stand between the windows above the main entrance.

A stone house was designed for nobleman Trajan Klyuchinsky and approved in 1810, probably by provincial architect Mikhail Chakhovsky; it first appears on a city plan of 1817. In 1835 Klyuchinsky's daughter Anastasia sold it to Franz and Eleonora Zimnicki, and from 1870 their son Konstantin owned it. Around the end of the 19th century it passed to nobleman Vikenty Nedvetsky, whose widow Marcellа held it until nationalisation in 1920.

The name comes from a legend, not a documented fact: the house is said to have belonged to the Minsk lodge "Red Torch", founded in 1816 and banned in 1822, but no archival proof exists. The owner Trajan Klyuchinsky's son-in-law was a lodge member, and the neighbouring estate on Bernardine Lane belonged to mason Jan Chodzko. Today the building houses the State Museum of the History of Theatre and Musical Culture.

The building sits in downtown Minsk surrounded by other historical structures in an active neighborhood area. Walking through this part of the city lets you take in the classical details and understand how the architecture relates to nearby buildings.

The Masonic link rests on city plans of the early 19th century that show the Klyuchinsky house drawn in the shape of a cross, which some authors read as a Masonic cross. No archival document confirms the legend, though the owner's son-in-law is known to have belonged to the Minsk lodge "Red Torch", founded in 1816 and banned in 1822.