The canals which conducted the water to the thermae, and were discovered in 2013 when the manhole was dug in front of the Ethnographic Museum. The canals were connected to the main aqueduct built by the Romans, which conducted water from the springs in modern Mali Mokri Lug. The thermae was built by the Roman military, as attested by the inscriptions on the bricks which contain markings of the Legio IV Flavia Felix. The entire area of the park is actually within the borders of the "Protected zone of Roman Singidunum". It is situated in the area that used to be the civilian sector of the city, outside the fortress. The remnants were visible until 1978 and due to the lack of funds to continue excavations or to cover it with the roof or a marquee, the remains were conserved and buried again. There are remains of another thermae, at the nearby Faculty of Philosophy Plateau. They are still visible and are used as benches. In general, the entire surrounding area is rich in Roman remains from the 1st to the 3rd century AD. They also include remains below modern Faculty of Philosophy, hotel Square 9 (locality Studentsi trg 9) and Ethnographic Museum (canals in front of the entrance in the museum). Below the roundabout are extremely well preserved walls, surrounded by the intact Roman floors and barriers. This section was discovered in 1989, but wasn't archaeologically surveyed. Some of the oldest remains are those discovered under the faculty building. They are dated to c.100 and were still made of wattle and "lep", a wall plaster made of mud. Apart from the thermae, there are also remains of a large building, with three apses and floor heating system. During the Ottoman period, the area was occupied by the Turkish cemetery, "mezarlık". The cemetery stretched to the modern streets of Knez Mihailova and Zmaj Jovina. Numerous remains from this period were discovered since the 1950s, during the various communal works conducted on the square and the surrounding areas. At the place of the modern square, there was an open green marketplace for over a century. At the beginning of the 19th century, farmers were selling goods at the entrances to the city. However, Turkish soldiers would often forcibly buy goods from them at the small prices, and then sell it themselves in the city for much higher amounts. After constant complaints from the farmers, vizier of Belgrade, after counseling with the city merchants, agreed to choose one place for the market: "da se učini u Beogradu jedno pazarište ili Toržište" ("a bazar or a marketplace is to be founded in Belgrade").