 In 1912-1913, he built his last major project - psychiatric hospital in Poteshnaya Street (now, Gannushkin Hospital).These buildings didn't make architectural landmarks; Mashkov, however, did make a lasting statement with his iconic monument to Ivan Fydorov (sculpture by Sergei Volnukhin).Like many contemporary architects, Mashkov was keen on studying and preserving historical national architecture, and in 1898 joined the Moscow Archaeological Society.