Near Vila do Abraão, the Lazareto ruins reveal an Ilha Grande that goes beyond its beaches: the island was also part of the history of public health, immigration, and incarceration in Brazil. The complex was planned in the 1880s to observe and isolate ship passengers due to the risk of epidemics. Research by Myrian Sepúlveda dos Santos, published in *História, Ciências, Saúde – Manguinhos*, shows that inmates received different treatments according to the class in which they traveled and that the site had later uses as a prison. Do not confuse the Abraão quarantine station with the Dois Rios prison, located in another part of the island. During your visit, observe the masonry remains and reflect on the relationship between maritime circulation, inequality, and sanitary control. Editorial tour suggestion: combine the walk around Abraão with Praia Preta, respecting the authorized paths and signage. Do not climb on the ruins or remove materials. Check access conditions before leaving; wet ground and roots require grippy footwear. Historical source: scientific article available in the useful links. Editorial revision: 09/30/2026.