Humanity is in a late medieval stage, prior to the discovery of steam and combustion but quite knowledgable about metalwork . A country decides to build a large-ish city and 7 long chains leading to mountains, in the hope they may lift the city, a testament to their riches and people – and inevitable hubris, of course, as someone inevitably takes it down.
A few details:
- There is a mountain range surrounding the valley the city is built in. The city has poured funding into huge half-kilometer chains reaching this distance.
- The chains are not attached to the mountain-side; long holes (with spaces for housing and material transport) have been dug into the mountain side, with structural supports to ensure the chain isn't just attached to one place.
- This design is replicated, albeit to a smaller extent, in the city, with about 50m between the hole the chain enters and where it's attached, again for redundancy.
- The chains are literal chain-links, and can be of any thickness and material available to late-medieval society – neither cost nor scarcity are problems.
- The chain-points in the mountains are of any height above 300m. Structural supports can be made in the mountains, but nothing can prop the city up from below.
Will it be possible to erect such a city on the valley floor and ultimately lift it, or is it an impossibility to lift something that large? How large, if at all, could such a city be before it is structurally unsafe?