Sorry if this is a stupid question, or if its been asked before which I assume so. I get how sediment could build up, by I have two questions based off this:

1. Firstly, does that mean in places built over ancient cities, we're actually getting higher above sea level? So a hypothetical settlement 1000 years from now, would be closer to space than a settlement in the same location now?

2. I was watching an episode of time team at Kew, the palace complex had the Dutch House, Orangery and a larger palace. The Dutch House and Orangery which remained in use to this day are still level, yet the dig-team found the palace beneath their feet. So was the palace built on lower ground than the orangery and dutch house, how did the palace end up underground but not the other buildings?