Let's face it: the other planets featured in the movie, named after the scientists who ventured to and later inhabited them ("Mann's Planet"), are cool. Although, for reasons of trying to keep things as "realistic" as possible, they're not insanely over the top in their presentation, the planets featured in Interstellar feel mostly like they could actually exist, refusing to be all out weird, zany or Star Wars-like in their execution. So we get to glimpse another world where the waves are as high as mountains, whilst another - almost Inception-like in its visuals - is so cold that the clouds have turned to ice (scientifically impossible, apparently, but it's an embellishment that we'll allow). All in all, Nolan clearly set out to render strange worlds that seems plausible when compared to our own Earth; it's fair to say that he achieved that... and then some.
Sam Hill is an ardent cinephile and has been writing about film professionally since 2008. He harbours a particular fondness for western and sci-fi movies.