Carolands, Beaux-Arts mansion in Hillsborough, California.

Carolands is a Beaux-Arts mansion in Hillsborough, California, set on a large estate overlooking the bay. The structure displays symmetrical facades with tall windows, colonnades, and stonework that recall French manor houses of the 18th century.

Harriett Pullman Carolan, daughter of Pullman Company founder George Pullman, bought 554 acres in Hillsborough in 1912 and had Parisian architect Ernest Sanson design the chateau; Willis Polk managed construction, and the family moved in during fall 1916. She separated from Frank Carolan in 1917 and closed the house the next year. In 1950 Countess Lillian Remillard Dandini bought it, saving it from demolition. It remains a private residence.

The name honors Harriett Pullman Carolan, daughter of Pullman sleeping-car magnate George Pullman. She had three 18th-century French period rooms installed, bought in Paris on the advice of antique dealer Boni de Castellane. The house is private; its interiors appeared on film in the 1982 adult movie All American Girls and in two documentaries, Three Women and a Chateau (2006) and The Heiress and Her Chateau (2014).

Carolands is a private residence and is not open to the public for tours or visits. The estate sits on 5.83 acres in Hillsborough, and the 1926 gate and the 1,000-square-foot gatehouse, restored in 2010, stand along the approach to the chateau. The house can be seen only from the surrounding streets.

In 1985 the mansion was closed to the public, yet guard David Alan Reilly sometimes let people in; on February 5 two high-school students asking for a look were raped and slashed, and Jeanine Grinsell died while Laurie McKenna survived. In 1982 the interior was filmed for the adult film All American Girls, the earliest surviving footage of the rooms.