Excerpted from Moon Handbook to Cuba: Sancti Spíritus Province is on virtually every visitor's list. Justifiably so, for its southwest corner is uniquely endowed. Trinidad -- Cuba's best-preserved colonial city -- counts among the triumvirate of preeminent destinations in Cuba, along with Habana Vieja and Valle de Viñales. In fact, many a visitor follows an itinerary that triangulates these three places.