The Sultan Ibrahim Mosque
A great dome on a converted Venetian cathedral.
**The largest Venetian castle in Crete**, occupying an entire hill above the town and the sea — and far larger inside than a visitor expects: lawns, walkways and scattered buildings within a long wall of angular bastions. Its building was a reaction to a catastrophe: in **1571** the Ottoman fleet under **Uluç Ali** raided Rethymno, sacked and burned it, and the Venetians resolved to fortify the town. The castle went up between **1573 and 1580** with an ambitious idea: that it should hold **the whole population of the town** under siege. But the people refused to move inside it, and it stayed military. In the end it failed at its purpose: it fell to the Ottomans in **1646** after a short siege. Its most prominent building is the **Sultan Ibrahim Mosque** with its large dome — originally the Venetian cathedral of Saint Nicholas, converted after the conquest. With it are small churches, powder magazines and officers' quarters. ⚠ The great value is **the view**: the old town, the harbour, the sea and the Ida mountains from the walls.
A great dome on a converted Venetian cathedral.
The old town, the harbour, the sea and the Ida mountains.
Renaissance fortification designed against artillery.
Fortezza, 74100 Rethymno, Crete
Because it belongs to the age of **gunpowder**. The tall round towers of medieval castles were designed against ladders and siege engines, but became **easy artillery targets** once cannon spread in the fifteenth century. Italian engineers therefore developed a new system, the ***trace italienne***: **low, thick, sloping** walls that absorb cannon shot instead of shattering, and projecting **angular or arrow-shaped bastions** that let defenders cover every foot of ground in front of the wall with crossing fire and no dead angles. The Fortezza is a clear example, as are the works at Chania and Heraklion.
**An hour** is enough, and the ticket is **cheap** and worth it without hesitation — the castle is Rethymno's largest monument and the view from its walls is the best of the town. ⚠ But know what you are seeing: the interior is not a furnished palace but an **open expanse** of lawns, foundations and scattered buildings, the domed mosque chief among them. Anyone expecting halls and displays will be disappointed; anyone who understands it as a **site to walk** with a view will be glad. ⚠ And go **before sunset** rather than at midday: there is no shade at all, and the low light improves everything.
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