- Cannot be built if Archaeological Museum has already been built in this district
The Art Museum is the second building inheriting the features of the old Museum building from Civilization V: Brave New World, and this one is exclusively dedicated to artwork rather than artifacts. That means that you cannot display any Artifacts at all in it! You can, however, display any of the multiple types of Great Work of Art in the game.
Activating its Theming Bonus is more challenging, though. You must fill all three of the Art Museum's slots with one of the following types of Great Works of Art, each of which must be created by a different Great Artist:
This means you cannot activate a Theming Bonus with a single Great Artist - you will fill the slots, but then you will need to trade with other players to get Great Works of the same type from Great Artists they had. Or, you have to wait for the right Great Artist, having the right type of Great Works, and manage to attract them to your civilization!
Art museums (or art galleries) are public spaces - paid for by the public, usually in the form of taxes – to house artwork meant to edify and uplift the masses. The art objects may take many forms: paintings, sketches, sculptures, ceramics, metalwork, prints, and now even video. Perhaps the first such effort at bringing high culture to the public took place in 1671 AD, the Amerbach-Cabinet in Basel (now the Kunstmuseum). But the whole idea of such collections for public edification really took off during the Renaissance, with the likes of the Capitoline, Vatican, and Uffizi galleries established. The 1700s saw another wave of iconic collections open: the Hermitage, the Prado, the Louvre, and the first American museum, the Charleston Museum, in 1773. The Louvre was established in 1793, soon after the French Revolution when the royal collection of art was declared the property of the people, beginning the trend of removing art from the grasp of the wealthy and putting it on tasteful display for the public to gawk at.