I was completely mesmerized watching this lovely time-lapse of the famous San Francisco fog. It should come as no surprise that San Francisco is filled with fog almost daily. There's is a funny reference to this on twitter: @KarlTheFog. One of my favorite tweets: "HEAT WARNING: temps will reach low 70s in San Francisco, avoid direct contact with the sun since you haven't seen it in 3 months." That's part of what makes this city so intriguing to tourists and locals. It's a wonder the population figures don't skyrocket. If you plan on visiting San Francisco, bring a jacket. Yes, even in the summer!