 The Ludwik Zamenhof Centre ( Polish : Centrum im . Ludwika <unk> w Białymstoku ) offers the visitors a permanent exhibition , ' Bialystok of Young Ludwik Zamenhof ' , and various temporary exhibitions , concerts , film projections , and theatre performances . The Centre has a branch of Lukasz <unk> ’ s Podlaska Library dedicated to the Esperanto language . 
