Cristillo de San Marcos: A Guide to Cristillo de San Marcos National Monument, Florida is a fascinating book created by authors from the US National Park Service. In this guide, you'll find detailed information about the history and architecture of Cristillo de San Marcos, one of the oldest forts in the United States. The authors talk about important events related to this object, revealing its importance as a cultural and historical symbol. The book contains many interesting facts, photos and maps that will help you better understand the uniqueness of Cristillo de San Marcos and enjoy its beauty during a virtual or real trip.