It is the only town of such size that almost all its historical residential area is still preserved, with buildings that date back to the 17th-19th century pointing out the idiosyncratic historical circumstances that gave birth to it. The Old Town of Corfu with the two fortresses (old and new). Have been included since 2007 in the World Heritage Monuments of UNESCO thus establishing its cultural value globally as a characteristic case of a Mediterranean town which has been developed on the basis of its defense. With the additional declaration "of outstanding universal value", its inscription in the UNESCO list reads: "The fortifications of the Old Town of Corfu holds a strategic position at the entrance of the Adriatic Sea. [...] Due to its historical course it has gone through a great amount of influence and thus constitutes a unique amalgam of different settlements of people. [...] In numerous cases it played a crucial part in the defense of the Venetian maritime Empire against the troops of the Ottoman Empire. [...] For all the above reasons it is classified among the most important Mediterranean fortified cities".