In larger cities, such as the Baths of Constantine, the baths tended to draw on the ornate, generally with colonnades, arches and large domes. The main materials used would have been stone, most likely large quantities of marble would have been used for the decoration of the walls, floor and columns. A hypothetical citizen would not enter the spa in the evening, since the spa generally closes at dusk, a citizen would instead arrive earlier in the day. they would most likely have found themselves inside a changing room called apodyterium where they would have undressed. After undressing, the citizen had a wide range of destinations to choose from. As the Roman baths were a social gathering, they provided all kinds of entertainment. Depending on the bathroom in question, amenities such as libraries, gardens or classrooms, to name a few. The key part of bathrooms, however, are the bathrooms themselves. Inside the baths there were three primary baths. the citizen generally passed from the "Calidarium" hot bath to the "Tepidarium" hot bath, both of which used a heating system by lighting fires and channeling the hot air through the hypocaust, the area under the floor. finally the citizen reached the unheated tub, the frigidarium, which was generally located in the center of the spa. In addition to swimming, citizens would have the opportunity to train in the water