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Photo: Omar1976, Public domain via Wikimedia Commons
These are some of the most important and impressive in Paraguay. El Ruta Jesuita is just about the only nationally organised Paraguayan tourist activity, so reaching them is easy. The Jesuit ruins are in such shape that you can still imagine the splendour it once possessed. The ruins are a UNESCO World Heritage Site whc.unesco.org/en/list/648.
Reductions were settlements established by Spanish rulers and Roman Catholic missionaries in Spanish America and the Spanish East Indies. The Spanish relocated, forcibly in many cases, indigenous inhabitants of their colonies into urban settlements modeled on those in Spain.
Ruinas Jesuíticas de la Santísima Trinidad del Paraná
It'll take one to two hours to see the whole area. Also features a small museum.
These ruins are well worth a visit and the 10 km to get there. Bring lunch and enjoy it in the old Plaza Mejor.