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Photo: Lars Curfs (Grashoofd), CC BY-SA 3.0 nl via Wikimedia Commons
These ruins are well worth a visit and the 10 km to get there. Bring lunch and enjoy it in the old Plaza Mejor.
Jesús de Tavarangue was a Jesuit Reduction located in what is now Itapua, Paraguay. The ruins of the mission, together with those of Trinidad were designated a UN World Heritage Site designated in 1993.
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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.