A mystery owner has just put a collection of 56 Porsches up for auction — and they're all white

• A rare collection of white Porsches collected over a decade is being auctioned in December.
• Auction house RM Sotheby's did not disclose the collection's mystery owner.
• The collection's "crown jewel," a 2015 918 Spyder, is expected to sell for $2.5 to $3 million.

A rare collection of 56 white Porsches is heading to the auction block.

Named "The White Collection," the car collector's unusual trove was announced by auction house RM Sotheby's on Tuesday. The auction is scheduled for December 1 and 2.