[YeGoblynQueenne]

>> On the other hand, the Ottomans failed to take Corfu in 1537 in no small part because of the new fortifications, and several attempts spanning almost two centuries (another major one was in 1716) also failed.[6][7]

The bastion fortifications of Corfu were established shortly before the last Ottoman invasion of 1716, by Count von der Schulenburg, appointed to the Job by Venice. They were destroyed later when Corfu joined the newly freed Greek nation with the treaty of 1864. The destruction of the Corfu fortifications was an actual clause of the treaty. Today, only the (Venetian) Old Fort remains and some few parts of the star-shaped walls. Allegedly, the fortifications were so renowned that the British wanted them destroyed in case they ended up being used against them. A bit of a shame, too, since they were really impressive and they would have made a spectacular historical site today. What remains is already interesting enough.

Sources: a bit of wikipedia to remind me of the dates and primarily local lore (I spend a lot of time in Corfu) and also maps depicting the Ottoman siege in 1716, showing e.g. fortified positions of the defenders and the invaders with detailed descriptions of the forces deployed, illustrations of gun emplacements and even the trajectories of enfilading fire etc. Such maps are often exhibited in Corfu, and I must surely look a huge nerd the way I spend hours poring over them every bloody time :)