The bastion heart shaped in plan with an acute angle, has two "piazza bassa" and one cavalier. It defines the southeast and the highest part of the fortification. Its name is due to Gabriele Tadini Martinego (1520) who started the construction of a circular tower at the place of the later bastion. It was one of the strongest bastions (the others were that of Pantocratora and that of Vittouri) which also suffered the main attack and most of the bombardment from the Turks. On the top of the bastion itself there was made a cavalier (which looks like a smaller bastion), whose main purpose was the better defense and control of the area around the bastion.
The grave of Nikos Kazantzakis, the famous Cretan writer, is situated on the highest point of the Venetian fortification at the Martinego cavalier. The inscription by the wooden cross reads: " I hope for nothing. I fear nothing. I am free ", a phrase taken from "The Odyssey" which Kazantzakis considered as one of his most significant works.
The playgrounds of the Academy of the local football team "Ergotelis" are located today on the main bastion and in the ditch around the bastion are the botanical gardens of the city.
With the recovery of Crete from Nikiforos Fokas, the seat of the bishopric is transferred from Gortyna to Chandakas, which became the capital of the island. The new cathedral, which is the most established and largest in the city, is dedicated to the Apostle Titos. Here, amongst other relics, there are gathered the Holy Skull of the Apostle and the miraculous icon of Messopapaditissas. When the Venetians took over Crete, they installed in the orthodox bishop the Latin archbishop, converting by that the church of St. Titos into a Latin bishop. In the middle of the 15th century, the Latin archbishop, F. Dandolo is renovating the church. Other distractions, caused by earthquakes and fire, resulted to the rebuilding of the church from the start around 1557. The church was a basilica, almost square in shape, with a dome in the middle and a bell-tower in the southwest corner. The church from the inside was divided in three aisles with two series of columns. During the Turkish period, the church was given to Fazil Ahmet Kioprouli and it was changed into a mosque, while the bell - tower was transformed into a minaret. The big earthquake of 1856 destroyed the temple which is being, once more, rebuilt. After the exchange of populations, the Church of Crete repaired it accordingly, and in 1925 it was dedicated again to Apostle Titos. East of the church there was the building of the archdiocese.
The Cathedral of St. Minas:The small church of St. Minas did not meet the religious needs of the constantly growing Christian community, so the demand arose for the erection of a new cathedral. The plot for the new church used to be a garden that belonged to a Turk from whom it was bought. The architect was Athanasios Moussis and in 1862 the foundation stone of one of the most magnificent and impressive Greek churches was laid. The outbreak of the Cretan revolution of 1866 demanded the stopping of the building work which will continue in 1883 in order to be completed in 1895, when the inauguration of the exquisite temple took place. The church is of the cruciform type with a dome based on a high spandrel, while internally there are also elements of a three aisle basilica. It has two bell towers, one in the northeastern corner and the other in the southeastern one. The right aisle is dedicated to Apostle Titos and the left one to St. Ten Martyrs of Crete. The inside of the church has gone through many changes with new additions. With plans of the architect Anastasios Orlandos the woodcut icon screen was replaced by another one made of marble, the same happened with the bishop's seat. The religious painting of the church was assigned to St. Kartakis who followed faithfully the principles and the models of the Byzantine icon painting. The hundredth anniversary from the inauguration of the Cathedral Church of St. Minas (1995) was celebrated with every solemnity that is suited in an equal occasion and more specifically to one of the most glorious and imposing Greek churches.
It was made by "capitano" Gianmatteo Bembo between 1552-1554, it dominates in today's Kornarou square, next to a later Turkish philanthropic fountain. It is decorated with coats of arms and other elements of the renaissance and of gothic type, while in the middle a big headless statue stands out of the roman period. The spring is ornated with floral and embossed elements.
It was made by Giovanni Sagredo between 1602-1604, part of it has been built in the Northwest corner of today's Loggia (Town Hall) and it is decorated with a carved female statue which according to Gerola's description probably with the left hand she was holding a shield, while with the right one a kind of a big hammer for display, representing the personification of Crete.
It was built in 1776 by Hadji Ibrahim aga. In order to keep it working, he dedicated almost all his property. It is unique in its kind that is still preserved today. It is of a circular type building with a "tholos" and around the walls there are semi-circular windows with rails, in front of each one of them there exist a tap with a stone basin for the water to be collected. Today it is used as a coffeehouse.
It is next to the external Gate of St. George, underneath the statue of Eleutherios Venizelos. Within an arched construction, which its top is decorated with floral elements, there is a plaque and the spout is within a relief decorated frame. The water was collected in a marble basin of a similar decoration.
It is in the Ikarou Avenue, next to the Epigraphic Collection of Heraklion Museum. Within an arched construction which, is surrounded by two big square columns, decorated with rosettes, there is a relief spout of fine workmanship. The water is gathered in a marble basin adorned by a richly decorated relief.
The Basilica of Saint Mark is one of the most important Venetian buildings-monuments in Heraklion. Today it houses the city’s Municipal Art Gallery. The Venetians, wishing to consolidate their dominance over their new colony (Heraklion) and to express their gratitude and love for their mother country, built a church in the city’s centre dedicated to Saint Mark, patron saint of Venice. The Basilica managed to survive various earthquakes which afflicted Heraklion over the centuries with only minor repairs. During the Turkish rule it was converted into a mosque, the Defterdar Mosque, named after Defterdar Ahmet Pasha, the head of the financial department. The Ottomans demolished the bell-tower of the basilica and raised a minaret in its place, which in its turn was taken down by the residents of Heraklion after the liberation of the island in their attempt to erase the unpleasant reminders and symbols of the Turkish occupation.
The Gate of Agios Geórgios (GR: Πύλη Αγίου Γεωργίου - Saint George also called the Gate of Maroula or Lazaretto) was one of the central gates of Chandax during the Venetian period. Today it connects Eleftherias Square with Ikarou Avenue and at the same time is used as an exhibition venue. The gate used to lead towards the eastern provinces of the city, the Maroula suburb and the Lazaretto. Designed by Giulio Savorgnan and dedicated to St. George, the monumental city side facade featured a relief medallion of the warrior saint on horseback, set directly above the finely carved stones that formed the main portal. This monumental facade was demolished in 1917 for the opening of today’s Democratias Avenue. Of the gate today, its entrance towards Ikarou Avenue is preserved, the internal domed hall and part of its climbing arcade which have been restored by the Municipality of Heraklion.