On Thursday 17 August 1944 the blockade of Kokkinia was carried out by the Germans and the Security Battalions. At dawn the telegraphs called for men between 14 and 60 years old to report to the square of St. Xeni, which was filled with people.

The museum houses numerous historical relics, war documents and archival material, fragments that reconstruct the heroic period 1940-1944.

An important chapter in the history of the Kokkinia blockade, which was one of the most brutal cleansing operations of the last year of the Occupation, was written in the historic square of Osias Xeni.

The urban plan of the city includes several different typologies of refugee houses, which were built by the Refugee Relief Fund (1922-1925) and by the Refugee Rehabilitation Committee (EAP, 1924-1930).

In 1927, in the northern part of the settlement, under the Republic Square (Fountain), which was then a cemetery, up to Filadelfia Street, in 30 blocks, the prefabricated houses were erected, which were built in Germany.

It is the first church founded in the settlement of Nea Kokkinia by the first refugees in 1922. It operated in a tent given to the refugees by N. Plastiras and was erected on the eastern side of the square of Ag.

The church of Osia Xeni is the parish of the district of Kilikiana, which was one of the first neighbourhoods of the refugee settlement. The church originally functioned inside a laundry. Later, its construction began at the junction of Ikoniou and Kordelios streets (today's Cyprus).

The building of the Bishopric of Nikaia is located in the square of Osias Xeni. It houses the ecclesiastical museum, which was inaugurated in December 1972, 50 years after the Asia Minor Catastrophe. The soul and creator of the church museum was the Metropolitan of Nikaia.

The Holy Church of Saint George was founded in 1923, in the northwestern part of the refugee settlement of Nea Kokkinia, initially in a wooden shelter, by the refugees who settled in the area, originating from Telmissos (Delmissos), Caesarea, Renkioi (Orfynio), Dardanelles, Magnesia of Shipylos a

The collection of the Municipal Gallery was founded in 1976 by donations from Greek artists who responded to the initiative of Dinos Katsafanas, the first elected mayor of Nikaia during the post-revolutionary period, with the aim of promoting the cultural development of the city.