Thesis/purpose of the article – The purpose of this article is to review the major investments in library buildings in Poland over the last 25 years. The description includes the buildings’ architecture in connection with their functional purpose and the rapidly changing library technology. Methodology – The method of comparative analysis (along with autopsy) of library investments was applied. Results/conclusions – In the history of Polish libraries, the last 25 years were a time of exceptionally profuse investment and large financial output due to the free market, Polish membership in the EU, and access to modern information and communication technologies.