There is a bit of tension involved with the new system of on-map wonders. It's most fitting for many wonders like Big Ben or the Forbidden City to be placed in a large, important city. But a lot of the mechanics of these wonders push you to fit them into some out-of-the-way spot, if you can do so and still find the production to build them. For example, Big Ben loses you a tile - probably a valuable tile - and provides no particular benefit to the city it is in (other than the Theater Square adjacency bonus).
(This problem is even more annoying for the Eiffel Tower and the Forbidden City, since flat-land-adjacent-to-city-center is often a tile that would be a good spot for an ordinary district, or may be necessary for an Aqueduct.)
Ideally, the game would naturally lead you to want to place Big Ben in one of your most important commercial cities.
A way to achieve this would be to let some wonders act like their corresponding district type, giving that city a unique ability to have a second e.g. Commercial Hub, including adjacency bonuses. This would make those wonders powerful options for city specialization.
You can also mix things up a bit, with some wonders coming with certain district buildings pre-built, or having a custom list of available buildings. For example, the Venetian Arsenal could come with an Arsenal pre-built, have options to add a Factory and a Shipyard, and get adjacency bonuses from both Industrial Zones and Harbors. This would let you scale back its somewhat ridiculous normal ability (double all ships produced everywhere) while still being very strong.
(This problem is even more annoying for the Eiffel Tower and the Forbidden City, since flat-land-adjacent-to-city-center is often a tile that would be a good spot for an ordinary district, or may be necessary for an Aqueduct.)
Ideally, the game would naturally lead you to want to place Big Ben in one of your most important commercial cities.
A way to achieve this would be to let some wonders act like their corresponding district type, giving that city a unique ability to have a second e.g. Commercial Hub, including adjacency bonuses. This would make those wonders powerful options for city specialization.
You can also mix things up a bit, with some wonders coming with certain district buildings pre-built, or having a custom list of available buildings. For example, the Venetian Arsenal could come with an Arsenal pre-built, have options to add a Factory and a Shipyard, and get adjacency bonuses from both Industrial Zones and Harbors. This would let you scale back its somewhat ridiculous normal ability (double all ships produced everywhere) while still being very strong.