What is the fine-grained topic of the following text: This square has been created in the 15 century and here we can find some very important art works as Palazzo Venezia and the Basilica di San Marco, that rises at the foot of the Capitol Hill, now location of the Rome municipality that hosts three palaces (of the Senators, of Conservators and Palazzo Nuovo). Only return the topic.
Historic landmarks and art in a 15th-century square in Rome