The house of snails
The Casa de los Caracoles (House of Snails) at Tamarit 91 is one of the most interesting buildings along the generally dull Carrer Parallel, and a good place to stop off on your way from Plaza España to the centre.
Legend has it that the original owner had the house built after coming across a stash of gold while looking for snails on Montjuic. In thanks to these gastropods he covered the façade of the building in snail motifs. Or that was his story anyway for covering up some early 20th century dodgy dealing.