The Collaborative International Dictionary of English v.0.48:

Rememberable \Re*mem"ber*a*ble\ (-?-b'l), a.
   Capable or worthy of being remembered. -- Re*mem"ber*a*bly,
   adv.
   [1913 Webster]

         The whole vale of Keswick is so rememberable.
                                                  --Coleridge.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "rememberable":
   celebrated, conspicuous, distinguished, eminent, esteemed,
   estimable, exceptional, extraordinary, marked, memorable, noble,
   notable, noteworthy, of mark, outstanding, prestigious, prominent,
   rare, recollectable, remarkable, reputable, salient, signal,
   special, striking, telling, unforgettable