The document summarizes different historical periods from prehistory to modern times. During prehistory, humans lived in small nomadic groups and painted on cave walls. The Ancient period saw the rise of early civilizations and writing systems, particularly the influential Roman civilization. The Middle Ages began approximately 500,000 years ago and the Muslims later conquered parts of Spain. The Modern era started 500 years ago with European exploration and colonization of other continents. The Contemporary period began 200 years ago with industrialization and technological advances that have transformed society.