It was the Greeks who first asked and discussed in a rational way two fundamental questions that never cease to concern thinking human beings: what is the nature of the universe, and what can I make of my brief time in it? Their answers, developed between the eighth century BC and the fourth century AD, are still relevant to the modern reader and traveler. The author associates each philosopher and his ideas with a particular tourist destination, and a gazetteer describes the sites and notes the people and ideas connected with them.