ISCHIA, a town of Italy, and capital of an island of the same name, with a bishop's see and a strong fort. Both the city and fortrefs stand upon a rock, which is joined to the island by a strong bridge; the rock is about seven furlongs in circumference. The city is like a pyramid of houses piled upon one another, which makes a very singular and striking appearance. At the end of the bridge next the city are iron gates, which open into a subterranean passage, through which they enter the city. They are always guarded by soldiers who are natives of the island. E. Long. 13. 55. N. Lat. 40. 30.