History literally passed through Pálffy Palace. Its uniqueness and immense significance lie in the fact that within a single object it visually captures a great number of key historical and architectural stages of the city’s development. In the basement we see evidence of a Celtic settlement (oppidum) from the 1st century, including a shaft for storing food, a grave, and finds that document the close proximity of the mint. The Roman period is illustrated by the proliferation of secondary building material used in the masonry of the building – clearly visible within the preserved early medieval walls of the 13th century Romanesque palace. The core of the town's Gothic palace with a chapel featuring a star vault from the 15th century was discovered in the basement and first floor of the building during a rescue survey in 1981–1987. Parts of the masonry, also from the 15th century, can be seen in the exhibition hall on the third floor. The Slavic period left its traces in the basement, where four graves from the 9th and mid-10th centuries were discovered. Further building modifications in Neoclassical style date back to the 17th and 19th centuries.