Capital of the prefecture with 82.439 inhabitants. One of the biggest Greek cities, commercial port and a significant industrial area. Characteristics of the city are its buildings with many floors, built one very close to another, and the intense activity in the quay and the market.
The Archaeologic Museum, with collection of things from the Prehistoric period till the Classic and the Hellenistic Period, and the unique in the whole world inscriptions and things of tombs of Iolkos and Nileia.
In the City Hall -a building of Demetris Pikiotis- is roofed the Public Picture Gallery with works of painting, carving and sculpture of Modern Greek Artists.
Interesting are the churches of Agios Constantinos, Agios Nicholas, Metamorfosis and the small church of Agia Triada, in the group of houses of Anauros, with remarkable wall paintings of the Greek artist Gounaropoulos.
In the City Hall of Nea Ionia is roofed the Public Picture Gallery with works of Bolos`s painters.
The house of Kitsos Makris, with works of Theophilus and Christopoulos, byzantine pictures, sculptured wooden articles and ceramics.
The traditional train (in older times it was connecting Bolos with Milies. It functions again in section devision of the civic railway).
In Anakasia -4,5km- is located the house of Kontos- the Museum of Theophilus, with wall paintings of the great painter, made in 1912.
In the area called "fournos of Balentza", there are some more wall paintings of Theophilus.
In Nea Demetriada -6km southwards- there are the ruins of Demetriada, the city that was founded in BC 293 by "Demetrius the besieger". In the same area one can see the well preserved theater, remains of fortification walls and traces of ancient temple. In the third and second BC century, Demetriada unfolded in a significant trading center. Near there are the ruins of the ancient city of Pagases, inhabited since the Neolithic Age and continually flourising from BC 1100 till BC 290. Pagasitikos gulf took the name of this city.
In the port -6km westwards- there are the two vaulted tombs of the second Neolithic Period (BC 2500-BC 1200) and the ruins of the acropolis of an ancient group of houses.
In Sesklo -14km westwards- there are the ruins of the acropolis of an ancient group of houses, the most ancient of the Thessalian area, dated in the Middle Neolithic Period. The central part of it is lying between two streams. One can discern the ruins of a mansion, on a hill. You can go to Sesklo from the national road of Bolos-Larissa and turn, according to the boards, when you are in the area of Latomeio.
In Dimini -6,5km westwards- the ruins of palace, houses of the Neolithic Age -4th BC millenium- and vaulted mycenean tomb.
In the Archaeologic Museun there are exposed a lot of things found by the excavations: Needles of bone, ending in manlike heads, dated in the Proneolithic years. Earrings of bone, looking like "human figures". "The column of the warriors", representing, in an expressive way, two young warriors (third BC century). "The column of Idisti", representing a young pregnant woman, dying in her bed -next to her there are standing her husband, with intensed agony on his face, the midwife with the dead baby and a maid. "The column of Stratonikos", representing a dead man (who is well dressed) saying good-bye to some young friend of him. "The column of Archidiki", representing a woman who looks forwards in a dreamy way. "The columns of Chirilli and Afrodeseia", of which the painted decoration is preserved very well, the dedicatory bas-relief of "Estia and the Ally" (4th BC century). The column of the tomb of Kinea and Frasimidas, representating two dead people saying good-bye to each other by stretching their hands (BC 450-BC 425). The column with the representation of a woman who holds a spindle (only one part of it is saved, BC 450). The golden jewels from Omolio and the medals with the head of Minerva sculptured on them (4th BC century), the column of the tomb of Sotiria, which is considered as "monument of folk art of the last Roman years" and the neolithic statuettes representing woman figures (standing up and sitting down) who probably are the godesses of fertility and fecundity.