Realistically, this is a dusty heap of stuffed animals well past their sell-by date and crying out for some government investment. It's worth visiting only if you are passing on your way to Finca El Abra.
There used to be a planetarium here, but questions about reopening were invariably met with sighs and shakes of the head from staff. It's just before the distinctive tower of the Archivo Histórico on the Hotel Colony road.