It's common in London to have glass over old buildings for basement level.
Fantastic Vatican City. It even has its own post service like real country. Entry to St. Peters Basilica is free of charge. The queue to there could look long, but it's not, it's line not to entry but to security check. The line took us about 15 mins, but be aware of tour guides nearby, they offer to buy a tour to avoid the queue, also they told us the line takes few hours, but it's not true. You can visit a museum and some part of the basilica if you buy a ticket, but the basilica itself is free and worth to visit it first. It has underground floor with bodies of previous popes! (no photos taken there as it's prohibited).
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