Jamestown by Carl Bridenbaugh. Bridenbaugh asserts that the Indian leader Opechancanough who coordinated the 1522 attacks on the colony was actually an Indian taken to Spain by the Spanish and educated by the Jesuits and Dominicans. His evidence has been questioned. However, his coverage of other Jamestown events also makes interesting reading.
Misquoting Jesus by Bart Ehrman--a study of how the New Testament has been changed by more than a thousand years of copying over and over and the earlier sources being lost. New discoveries show that some of the favorite stories were added in the Middle Ages hundreds of years after the original authors, and other changes are the result of mistakes and rewording to show "what the original author really meant."