The Tiwanaku civilization was an ancient culture that thrived in the Andean region of present-day Bolivia from around 400 to 1000 AD. It is known for its impressive architectural achievements, including the Tiwanaku archaeological site, which features large stone structures, temples, and monolithic sculptures. The civilization was influential in agriculture, utilizing advanced farming techniques such as raised-field agriculture to support its population. Tiwanaku was a center of trade and cultural exchange, connecting various groups across the Andes. The civilization's decline around 1000 AD is attributed to environmental changes and social factors. Despite its fall, Tiwanaku's legacy influenced later cultures, including the Inca Empire.