I have just finished reading the 2 volume True History of the Conquest of Mexico by Diaz Del Castillo. The book was written in 1568 by Del Castillo who was one of Cortes' officers throughout the campaigns in Mexico in 1518-1521. Although the book is often frustrating in its lack of detailed descriptions of the sites, sounds, and people Del Castillo was encountering (and fighting), the brief glimpses of color he does provide throughout his story are just incredible. An eyewitness account by one of only a handful of men (one of less than about 500 who lived) who saw the amazing city of Tenochtitlan, Mexico City, built in the center of a lake.
The story of the conquest itself is just unbelievable; the audacity of these few Spanish amazing. Although I had heard the story before of the flight from Mexico City and the subsequent return, siege, and conquest to read it told by a participant is just great. Highly recommended to any who are interested in such things.