In S1E17, Rory and Lane go to Madeline’s house for a party. Lane is freaking out about the house. She asks Rory, “Is this what your grandparents’ house looks like?” Rory says, “No. I mean, it’s big, but it’s not this… Hearst castle-y.”
Hearst castle is a mansion on the California coast, built in the early 20th century for newspaper tycoon (and Nazi) William Hearst. The structure was inspired by a Spanish cathedral. Other names for the estate include “The Ranch,” “La Cuesta Encantada,” and “San Simeon.” Today it is a popular tourist attraction.