In the UK, it is not considered an infringement to photograph architecture, three-dimensional artwork, and "works of artistic craftsmanship", if it is permanently situated in a public place or in premises open to the public. Just don't take photos of the temporary exhibitions or paintings whose author has not died within at least the last 70 years.
No. This is using CC0. It's not really a Creative Commons license per se, but it's more of an explicit, universal public domain dedication. Some countries might not technically allow people to release works into the public domain on their own, or still have them be subject to other conditions such as moral rights.
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