morgan was most famous for her 1919 project in san simeon, san francisco for the hearst family. the project included designing and building a european styled castle. it became known as the hearst castle. it was made of architecture from italy and spain. it took 25 years to finish building the castle. morgan’s architectural team also designed many houses, churches, cottages, schools, and many other types of buildings. her biggest goal was always to satisfy her clients and "design buildings from the inside out." she did this in many styles. they included byzantine, italianate, craftsman, gothic and romanesque.