The Metropolitan Cathedral of Aegina is a three-aisled temple with three red domes. The middle aisle is dedicated to the Virgin Mary's feast. The right aisle is dedicated to the patron saint of Aegina, Agios Dionysios and the left aisle is dedicated to St. John the Theologian.

The Metropolitan Church of Aegina was built in 1806 with the money of the Holy Monastery of Virgin Mary the Chrysoleontissa. In the Metropolis there are many historical heirlooms, a marble temple, remarkable hagiographical frescoes and built-in icons. Opposite the Despotic Throne, the governor's stall is still preserved. The bell tower next to the Temple is a work of St. Kleanthis and Ed. Schaubert.

The Metropolis, among others, was used as a parliamentary chamber in 1827 and in 1828 for the oath of the first government of Greece and as a meeting place of the Elders' Assembly. Especially in the Metropolis on January 11, 1828, the people of Aegina welcomed Captain Kapodistria, where the famous speech of Theophilos Kairi was recited. A few days later, on 28 January, he held the ceremony of his inauguration as First Governor of the Greek State and of the Panhellenic Council of 27 members, which constituted the temporary anti-governmental committee.

In 1830, after a donation made by a Swiss banker called Eunardios, the Eunardios School of Teaching was built next to the Cathedral which is a neoclassic building. Apart from the central part, the building has 2 rooms. In one room was the central school for students who continued their studies. In the other room were three-month training courses for teachers.

The Government House is located near the Cathedral, in the center of the city. It's a very important building for modern greek history. In this building was the first government of Greece. It was Ioannis Kapodistria's house.

It's a two-storey, stony building with a wooden roof. On the first floor, the first room was the office, opposite the secretary's office and on the right was the record office room. Today, on this floor, is the historic record office room of Aegina.

Next to the Government House, is another traditional building made of stone, which today is the Municipal Library of Aegina.

In the southeast of the city, is the Orphanage which was built by Ioannis Kapodistrias in a building block which was offered by the Dimogerontia of Aegina. It was used for shelter and as a school for the orphans. The orphanage had laboratories where the children learned skills. So, there were printing-houses, dressmaking, shoe making and bookbinding. The church of Sotiras and the National Library were built in the orphanage. In this building up to 1828, was the first archaeological museum, the first National Printing house, the lithographic, the library and the first greek school of Music.