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That's a great idea.

That's what happened with the new Bloomberg HQ in London. It's a nice museum underground.

It's been pretty amazing walking past that site everyday seeing the pictures of the artefacts on the hoardings. Now it's all done, I keep meaning to visit the museum.

For people who have NO idea what was under the new Bloomberg HQ in London, here's a link:

https://www.londonmithraeum.com/

That’s what Apple had to do with its main Puerta del Sol store in Madrid: https://www.theverge.com/2013/7/10/4512318/apple-store-spain...

When I visited Bologna, I found that their main library is that way -- they have a glass floor over the excavations below.