In the area of today's Varaždin Spa with thermal spring, there are from 1 - 4.ct . Roman settlement Aquae Iasae. The public part of the Roman settlement was located on the uppermost terrace of the hill spa (now Park), part of the residential terraces that descend to the foot of the hill, and have established the foot of trades and trade show facilities (address). Thanks to archaeological excavations and research that since 1953. The department conducts Ancient Archaeological Museum in Zagreb, in the park today unveiled a complex of Roman public architecture (1st - 4th century). It consists of the baths that make buildings with swimming pools and the basilica, a forum with porches situated around the main sources of thermal and Capitolium the temples of Jupiter, Juno and Minerva. The statue of the goddess Minerva with a pedestal found in 1967. at the entrance to the temple.

Specific conditions of the soil around the thermal spring and travertine deposits, led to a good conservation of Roman architecture, so that this complex is one of the best preserved sites in Croatia.

The thermal sulfur water springs in the area of ​​present-day park is extremely therapeutic, temperature 58 ° C, and the current findings suggest the use of the same source more than 2000 years, from prehistory to the present when the same source and supply the Special Hospital for Medical Rehabilitation.

Explored parts of Roman architecture are located within a public park or spa garden which was established in 1820th year and at that time consisted of two parts: a decorative garden with a pavilion and hot music pavilion on the ground (today an archaeological site) and landscape gardens on the slopes that exceed the upper parts of the park forest. Portal at the entrance to the park was built in 1865. year, and is decorated with a relief passage nymphs and Roman inscription, and with two marble lion with fish tails.