The Museo de La Ciudad Virginia Choquintel (Alberdi 553, tel. 02962/430647) does a lot with a little on natural history, ethnology and aboriginal subsistence, and historic displays on maps and mapmaking, the evolution of island communications, and astronomy. Occupying the former storehouses of the Asociación Rural de Tierra del Fuego [1], the museum is open 9 a.m.–8 p.m. weekdays and 3–7 p.m. Saturday.
Río Grande [2] has few architectural landmarks—or few buildings of any antiquity—but the Obras Sanitarias waterworks tower (Lasserre 386), at the Plaza’s northeast corner, dates from the Juan Perón era (circa 1954).
El Cine 1 & 2 (Perito Moreno 211, tel. 02962/433260) shows current films in modern facilities but turns up the volume to excruciating levels—bring or improvise ear plugs, just in case.
Links:
[1] http://www.moon.com/destinations/chile/southern-patagonia/tierra-del-fuego
[2] http://www.moon.com/destinations/chile/southern-patagonia/rio-grande-argentina