When I was over in Barcelona last September, at the European Photobloggers meetup, I shot a sequence of 19 images from a high point in Park Guell. Each of the 19 images (shot at 57mm at f/8) were used to construct this image, and the final panorama covers a view of around 320°.
From a technical point of view it was relatively straightforward: the 19 images were shot using a Really Right Stuff BH-55 PCL-1 panning clamp (overlapped by around 30-40%), and then the panorama constructed with PTGui. At full resolution then the final image is 43,195px by 3516px: almost 125 megapixels.
The reason I haven't posted it before is because the small version looks rubbish, even at 1030px wide. With that in mind though I've posted a much bigger version here:
This is 7716px by 533px, and weighs in at 1.8MB, so may take a bit of time to load :)
If you were following chromasia last September you will be able to identify some of the landmarks I shot during my trip. From left to right these are: the power station; the exterior of the Sagrada Familia (an interior HDR is here); the communications tower near the Olympic stadium; and the Torre de Collserola communications tower and the Temple de Sagrat Cor.
So, if you've ever wondered what down-town Barcelona looks like from the top of a hill, now you know :)