Now on at the Academy of Natural Sciences in Philadelphia in the USA, Creatures of the Abyss (to 6th September 2010). It sounds rather kiddy-oriented and thus likely to be over-run by little monsters and their mothers, but it’s said to have…
“Full-scale models, preserved specimens, exploration vehicles, and a bioluminescence theater”.
… and there are some (presumably) kid-free evening openings.
It’s accompanied at the same venue by the exhibition A Many-Colored Glass: Ethereal Images of Microscopic Marine Life — the catalogue for which is available via print-on-demand at Blurb.

An illustration for At the Mountains of Madness? No, it’s a scientific photomicrograph of some ascorbic acid and liquid crystalline xanthin gum. (Not part of the exhibition).
If you’re in London, England, then the Natural History Museum has the similar major summer exhibition The Deep (to 5th September 2010). Review with photos
