The Amazon rainforest is often seen as untouched wilderness, but recent research shows that it has been shaped by thousands of years of human activity. Before European contact, Indigenous peoples managed the forest through practices such as forest domestication, soil enrichment, and landscape modification. These actions left lasting marks on the forest that can still be detected today. In this study, we present remote sensing tools (LiDAR, SAR and optical imagery) that can be used to identify subtle changes in forest structure and hidden archaeological features beneath the dense canopy. These include ancient earthworks and forest patches with unique species and structure, revealing that many parts of the Amazon were managed. Indigenous societies developed strategies that maintained forest productivity even during past climate changes. Thus, we hypothesize that historically managed areas may still support high biodiversity, stable ecosystems, and carbon storage today. Understanding the influence of these legacy landscapes can improve conservation planning and climate models. It reveals that past human activity played a key role in shaping ecosystems that remain resilient today. Combining modern technology with long-term historical knowledge can help design more accurate and effective strategies to protect the Amazon and other tropical forests facing growing environmental pressures.