The 36,000-square-foot home is very castle-like, with Gothic doorways, art galleries, and 13 fireplaces.
Still, the house has all of the amenities you would expect from a modern mansion, including two swimming pools, tennis courts, and a high-tech home theater.
The home was previously listed for $48.9 million in 2011, and though it's not clear who the owner is, some rumors have hinted that the seller was Robert Lent, cofounder of software company Ariba.
Regardless of the owner, this Silicon Valley mansion has to be seen to be believed.