The beginning of the 20th century was marked by a construction boom in Lviv. The theoretical achievements of scientists at Lviv Polytechnic led to the rapid development of the construction industry, with the outskirts of Lviv supplying raw materials for numerous brickworks. The central part of the city was most actively developed. There the best Lviv architects built monumental buildings for administrative and financial institutions, as well as objects of public importance. Very often, outdated 18th and 19th century buildings were demolished for their construction, causing acute dissatisfaction among historians, restorers, and the public. Thanks to the active civic stance of professional photographers, priceless evidence of Lviv's past has been preserved through photographs of buildings, streets, and squares taken before their destruction: unknown corners of underground Lviv that remain unexplored. The photo shows one such corner, discovered during the construction of a building site for the Chamber of Commerce and Industry building on Akademichna Street, 17 (now T. Shevchenko Avenue), designed by architects Tadeusz Obminski and Alfred Zacharevich.