▁mountain ▁( and ▁techn ically ▁outside ▁its ▁borders ▁depending ▁on ▁who ▁is ▁asked ) ▁lies ▁Park ▁Gü ell , ▁arg u ably ▁the ▁most ▁famous ▁work ▁of ▁Catal onia ' s ▁most ▁famous ▁architect , ▁Anton i ▁Ga ud í . ▁ ▁On ▁" C arr er ▁de ▁les ▁Carol ines ", ▁between ▁Pla ça ▁Les se ps ▁and ▁Font ana , ▁lies ▁Casa ▁Vic ens , ▁Ga ud í ' s ▁first ▁major ▁work ▁of ▁architecture ▁and ▁a ▁st ap le ▁in ▁his ▁canon ▁of ▁modern ist ▁design . ▁An ▁occupied ▁house ▁for ▁dec ades , ▁Casa ▁Vic ens ▁only ▁recently ▁became ▁a ▁tour ist ▁att raction ▁on ▁November ▁ 1 5 , ▁ 2 0 1 7 . ▁The ▁building ▁was ▁declared ▁a ▁UN ES CO ▁World ▁Heritage ▁Site ▁in ▁ 2 0 0 5 . C asa ▁F uster , ▁a ▁f abled , ▁grand ▁modern ist - style ▁hotel ▁that ▁lies ▁at ▁the ▁edge ▁of ▁Gr à cia ' s ▁southern ▁( water ) ▁end ▁on ▁the ▁Pla ça ▁de ▁Nicol ás ▁Sal mer ón . ▁Design ed ▁by ▁Catal an ▁master ▁architect ▁L lu ís ▁Dom ène ch ▁i ▁Mont an er ▁between ▁ 1 9 0 8 ▁and ▁ 1 9 1 0 , ▁the ▁orn ate ▁house ▁was ▁converted ▁to ▁a ▁hotel ▁in ▁ 2 0 0 4 . ▁ ▁In ▁the ▁Pla ça ▁de ▁la ▁V ila ▁de ▁Gr à cia , ▁the ▁bell ▁tower ▁marks ▁the ▁old ▁administrative ▁centre ▁of ▁the ▁former ▁independent ▁municipality