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]