We did this initially because we were tired but wanted to get the most out of our Copenhagen Card. The tour, however, turned out to be a really nice experience. It's an hour long with a live tour guide who can speak three languages. We got a lot of great information, but they also knew when to shut up and just let the sites do the talking, we covered a lot of ground and got some excellent photo ops, too. This is worth it even if you have to pay, but you'd be nuts to miss it if you have a Copenhagen card!
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