The Smithsonian, replaces Hermitage.
More

Culture (5 vs. 2).
+25%

Culture in the city, and 50% of the

Culture from Great Works, World Wonders, Natural Wonders, and improvements is added to the

Tourism output of the city.
Boosts the

Culture and

Science output of Museums and Broadcast Towers in all Cities by +5.
+5

Science and +5

Culture if Themed.
Does not require an Opera House in this City.
Becomes available later than the Hermitage which it replaces.
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While this UNW comes later than the Hermitage, it actually provides some very powerful bonuses and can make the late game of America not to be underestimated. In addition to 5 flat

Culture, the UNW also gives a +25%

Culture in the city (most certainly your capital) as opposed to +1 Culture for every 4 citizens in the city from the Hermitage. To put things into perspective, a city with 100 base

Culture gets 25 additional

Culture from the UNW. For the Hermitage to provide the same amount, you would need 100

Citizens and I have yet to see any city reaching that number.
Then, this UNW really gears America for a CV if that's what the player is going for. The "50% of the

Culture from Great Works, World Wonders, Natural Wonders, and improvements is added to the

Tourism output of the city" isn't to be underestimated, especially when you look at when this becomes available. The National Visitor Center gives takes 100% of the

Culture and Stadium takes 25% of the

Culture (both of which excludes Great Works) and adds to

Tourism but both are only available in the Atomic when you hopefully are almost there with that CV.
What if you pursue other victories? The fact that this UNW gives Museums and Broadcast Towers +5

Science and +5

Culture means that, if you go wide, you can still a leader in technology and/or policies. While the +5 yields doesn't appear much at this point, the modifiers that you hopefully accumulated in your cities will hopefully make them impactful while competing for the victory against the AI.
Rating: 4.5

/5

(subjected to change as I compare to other similar units)