We took a 2.25-hour tour, that ended up being 3.00 hours due to the heavy traffic. The tour was wonderful and I HIGHLY recommend it. It cost $35/per person and is on a double-decker bus with the top floor open to the sky (where we sat). Two hours into our tour I asked our guide if she had a photographic memory because she was constantly pointing this building or that, giving you either what company owned it, who the architect was, the year it was built, etc. Although I'm more entranced with nature usually, this city tour opened my eyes to the beauty of architecture, hence my TON of photos (plus many more that I deleted before creating this gallery).