This Gaudí masterpiece was rescued from obscurity and opened to the public in 2013. Built between 1900 and 1909, this private residence (still owned by the original Guilera family) has a castle-like appearance with crenellated walls of stone and brick, narrow stained-glass windows, elaborate ironwork and a soaring turret mounted by a Gaudían cross. It's a fascinating work that combines both Gothic and Modernista elements.
Guided tours in English (€16 per person) take place on weekends at 11am. At other times, you can visit the interior of the building and the grounds with an audioguide that gives historical background.
The downside: it's a long walk to a train station, though many buses pass near (including bus 22 from Plaça de Catalunya). Be sure to call before making the trek out – Bellesguard sometimes closes for private events.