This blank world history timeline is meant to be kept and added to over several years, ideally between about 4th and 12th grades. Inspired by Charlotte Mason's Book of Centuries, it features 2 pages for each century from 3500 BC to the present, plus additional pages covering the prehistory periods of Lower Paleolithic, Middle Paleolithic, Upper Paleolithic, and Neolithic. Additionally, each double page spread is divided into world regions. See http://researchparent.com/blank-world-history-timeline/
for a free version and for more details on how to use this timeline.