Hidden civilizations refer to societies that existed in the past but were not widely known or documented. These cultures often thrived in remote areas, such as dense jungles or deep caves, making their discovery challenging. Examples include the Muisca of Colombia and the Hohokam of the American Southwest, whose advanced agricultural practices and trade networks were largely overlooked until recent archaeological studies. Archaeologists use various methods, including satellite imagery and ground-penetrating radar, to uncover these hidden civilizations. Discoveries can reveal unique aspects of their lifestyles, such as their art, architecture, and social structures, contributing to our understanding of human history and cultural diversity.