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Old 12-03-2013, 09:44 AM
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CalMeacham is online now
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Join Date: May 2000
Location: Massachusetts
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[B]Patra-Bannk[/B in Tony Rothman's the World is Round. I don't want to explain it, because that would ruin the story. suffice it to say that the world seems unreasonably big for its density

Rocheworld, the setting for several of Robert L. Forward's novels. It consists of two close-together worlds filling the Roche limit with weird and interesting effects (including an intra-planet waterfall

Forward's Dragon's egg -- a neutron star with intelligent life on it, the setting for two of his books.'s_Egg

I see that I am one of the few who took the OP's request as referring to physically interesting worlds. There are plenty of societally interesting ones.