Tom Perkins's "The Maltese Falcon"

[Note: Only the first three minutes of the second video are pertinent to this post.]

Mystery solved. The mystery ship is "The Maltese Falcon," built by venture capitalist multi-billionaire Tom Perkins. It is the world's largest sailing yacht. It is 289 feet long and 42 feet wide, the masts are twenty stories (191 feet) tall, and it cost $130 million.

And it's attracting a lot of attention from tourists at Fisherman's Wharf today.

Just for perspective, the last photo below shows someone standing on the deck.