Municipality Of Heraklion:  The official web-site of the city.

Heraklion -- Wikipedia:

Iraklion -- Frommer's:  An overview from the tour guide company.

Herakleion:  A concise introduction to the city from traveller Grisel Gonzalez.

Iraklion City Map And Virtual Tour:

Venetian Walls Of Herakleion:  Brief information from the Hellenic Ministry of Culture.

Prefecture Of Herakleion:  Includes hours information.