This edition is intended to get acquainted with the history of one of the most interesting buildings in St. Petersburg, built at the turn of the XIX-XX centuries and known as the Kelch mansion. Its architecture embodies the features of late eclecticism and modernity. The mysterious story of the owners of the mansion. the perfection and originality of its interiors, the masterpieces of sculpture, painting and applied art concentrated in it, arouse the constant interest of visitors.