@lain It remains unfinished because the anarchists/communists vandalized it and burned the plans in 1936, 10 years after Gaudi's death. They were on a priest-murdering spree so the people still working on the project were lucky to get out of there alive. All work today is based on what people think Gaudi wanted, but some of it is so complicated they need computers with the latest software to replicate what that 19th century mad-lad could do by hanging chains.