Plot: The Depot That Made Dallas The Place: Dallas, Texas A local historian calls in the History Detectives to find out if a disused depot was the first railroad station in Texas and if it was responsible for putting Dallas on the map. Mexico Peso The Place: San Antonio, Texas Searching through his great-grandfather's belongings, a San Antonio man finds Mexican currency and suspects a link to infamous bandits Emiliano Zapata and Pancho Villa