I spent a week in Prague in April 2011. Fantastic city. But my main discovery of the trip was a painfully obvious one: there are thousands of brilliant artists out there whose names I've never heard before. Directly related to that, the single biggest highlight of the trip was probably the Veletržní palác (part of the national art gallery).
Many of the photos are geotagged (although not always entirely accurately), a first for me. I carried my GPS unit with me and used the tracks it generated to tag the photos.