Mount Vesuvius erupted in 79 AD, destroying the cities of Pompeii and Herculaneum. Pliny the Younger, a historian who witnessed the eruption, provided the oldest surviving description of the tall, mushroom-shaped ash cloud above the volcano. The cities were buried under ash and lava, preserving structures and remains intact for nearly 1,700 years until excavations began. Today, Pompeii is a well-preserved archaeological site that provides insight into Roman life, with remnants of buildings, artifacts, and even victims' bodies left behind from the fateful eruption.