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Throughout the world, more and more counties are becoming less religious. The countries that are the most religious tend to be poor African countries, and the least religious countries are the more affluent Western counties.
https://www.telegraph.co.uk/travel/maps-and-graphics/most-religious-countries-in-the-world/
When people feel less religious, they stop going to church, which eventually means you'll have some empty churches.
So, what do you do with them?
One of the more creative countries is the Netherlands, where only 26% of the population consider themselves to be religious.
As of this week, one-fifth of all the churches in the Netherlands have been converted to secular uses, like community centers, museums, apartment buildings, and gyms.
If you look at the pictures in the link below, you'll see some facilities that are very attractive.
https://www.huffpost.com/entry/dutch-churches-secular-building_n_5d23855ae4b01b83473ae3a2
I'be been to Stockbridge, Massachusetts, and have seen the church where Arlo Guthrie enjoyed "a Thanksgiving dinner that couldn't be beat" more than 50 years ago (it's now the Guthrie Center), but there IS one re-purposed church that is far more intriguing.
One of the most advanced computer centers in the entire world is the Barcelona Supercomputing Center, which is located in a former chapel named Torre Girona.
https://en.wikipedia.org/wiki/Barcelona_Supercomputing_Center
Here is the outside view:

And here is the inside view:

The center is mentioned in Dan Brown's 2017 novel, Origin.