integrity of the City of Los Angeles." The restoration included work on the building's floor, wood, doors, windows, art stone, and plaster. The restored building was opened to the public in 2015. In January 2015 it was announced that, following extensive renovations, the house would once again open for tours on 13 February. The 24-hour event drew large crowds through the night, with many waiting in line for over three hours for admittance. In 2015, the National Park Service submitted the Hollyhock House along with nine other Frank Lloyd Wright properties to a tentative list for designation as World Heritage Site. Revised proposals were submitted in 2018. Eight properties were ultimately inscribed on the World Heritage List as part of a submission called "The 20th-Century Architecture of Frank Lloyd Wright" in July 2019. When Hollyhock House together with the seven other buildings in the US were added to the UNESCO World Heritage List, it was the first time that modern American architecture had been recognized by that organization. Features As with many of Wright's residences, it has an "introverted" exterior with windows that seem hidden from the outside, and is not easy to decode from the outside. The house is arranged around a central courtyard with one side open to form a kind of theatrical stage (never used as such), and a complex system of split levels, steps and roof terraces around that courtyard. The design features exterior walls that are tilted back at 85 degrees (which helps provide a "Mayan" appearance sometimes referred to as the Mayan Revival style), leaded art glass in the windows, a grand fireplace with a large abstract bas-relief, and a moat. Water is meant to flow from a pool in the courtyard through a tunnel to this inside moat, and out again to a fountain. The front doors are stepped similarly to the entryway. The split doors rest on pins and swing open easily despite their massive weight. The keyhole is concealed with a decorative flap. The hollyhock (Aline Barnsdall's favorite flower) is used as a central theme to the house, with many symmetrical decorations adapting the plant's general appearance. Planters are decorated with the motif and filled with the plants themselves, and Wright's stained glass windows feature a highly stylized hollyhock pattern. An interesting feature is the mitered glass corners at the windows; an early idea Wright later used at Fallingwater. Hollyhock House