Trelew

Museo Paleontológico Egido Feruglio (al Mef)
Museum with a fairly large collection of Patagonia dinosaur bones. Also serves as a research facility. Admission is $15 Ar for adults.

The Museo Municipal de Artes Visuales is a fantastic little art gallery featuring local artists in the town square that is worth a short visit.

The Museo Historico Regional Galles is an interesting, if random, collection of things detailing the city's Welsh history. It is located in the old train station: Sarmiento y 28 de julio.