Barcelona "modernista" architecture (related to the movement known as Art Nouveau in the rest of Europe) developed between 1885 and 1950 and left an important legacy in Barcelona. Several of these buildings are World Heritage Sites. Especially remarkable is the work of architect Antoni Gaudí, which can be seen throughout the city. His best-known work is the immense but still unfinished church of the Sagrada Família, which has been under construction since 1882 and is still financed by private donations. , completion is planned for 2026. Barcelona was also home to Mies van der Rohe's Barcelona Pavilion. Designed in 1929 for
Sagrada Família narrow spiral staircase of over 300 steps. There is a posted caution for those with medical conditions. As of June 2017, on-line ticket purchase has been available. As of August 2010, there had been a service whereby visitors could buy an entry code either at Servicaixa ATM kiosks (part of "La Caixa") or online. During the peak season, May to October, reservation delays for entrance of up to a few days are not unusual. Construction on Sagrada Família is not supported by any government or official church sources. Private patrons funded the initial stages. Money from tickets purchased by tourists