UpdateThe correct answer to today’s question was Prague, Czech Republic, where swimmers dove into the chilly waters of the Vltava River for their traditional Christmas winter swimming competition. 

It’s the day after Christmas, and just outside the boathouse ...

The photo today shows swimmers braving cold waters in a competition of sorts. But where in the world is it? (The bridge in the background should be a big clue.)


(David W. Cerny/Reuters)

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