What civilization were discovered by the eurpean explorers?

European explorers encountered several advanced civilizations during their voyages, most notably the Aztec and Inca empires in the Americas. The Aztecs, located in present-day Mexico, had a complex society with impressive architecture and a rich cultural heritage. The Incas, in South America, built a vast empire in the Andes, known for their sophisticated agricultural techniques and extensive road networks. Additionally, explorers encountered various indigenous cultures across North America, the Caribbean, and beyond.