Barnsdall Art Park & Hollyhock House

Time Out says

After oil heiress and philanthropist Aline Barnsdall bought this cute little hill after the end of World War I, she engaged Frank Lloyd Wright to build her a group of buildings at its summit. The complex was designed to include a cinema, a theater and an array of artists' studios alongside Hollyhock House, Barnsdall's proposed home, but it was never completed and she never moved in.

Barnsdall went on to donate the house, guest house and 11 acres of the land to the city on the premise that they be used as a public art park. More than eight decades later, the site still fulfills that role, with exhibitions in a variety of different gallery spaces. Reservations for tours of the restored buildings—now a Historic National Monument—aren't required unless you're in a group of ten or more.

In the summer, the park hosts a variety of al fresco cinema nights, wine tastings and cultural events that bring out a nice mix of singles, couples and young families.