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Cost depends on the size and design of the city and a thousand other factors. Speed is more a factor of money than anything else. Assuming 1 billion people, I could see costs between 10 and 40 billion …

Many modern people live on active shield volcanoes, Hawaii for instance is nothing but a large shield volcano, the key is to live ias far from the the actual crater and active areas as possible. this …

Not as much as you think. Obviously, they need to keep dinosaurs out of their crops, but hunting usually takes care of that. Viking means bows, spears, and traps, which means dinos don't stand a chanc …

A quarter mile is not that bad, 700 meter ziplines exist. The longest footbridge span I know of is the Kusma-Gyadi Bridge in Nepal which spans ~300 meters. The hardest thing is getting the first piece …

An artificial sky is a great idea, psychologically being able to see the sky is a big deal, especially on the span of years or more. How to do it better 1. If they paint the ceiling with semi-refl …

Just based on what we can see, wide doors, and it does not look they would be able to use a door handle without the legs getting in the way, so doors might open up or they might use their feet to open …

They wouldn't as the species would have long ago gone extinct from extensive starvation. As stated the species cannot feed itself, it can't find food reliably because it cannot navigate nor control i …

Your pillars should already be invisible already. How are they able to see the pillars in the first place? Your under-city should be pitch black. Just don't put lights on the pillars. If there is e …

Give it some form of automated maintenance. Alternatively, an engineered species of lichen or coral-like organism could keep a mineral based structure in good repair and vastly extend its lifespan. Li …

Consider the real world underground city of Derinkuyu in Turkey They stumbled on a simple solution, a giant stone disc in a groove for a door. Easy to move and brace from the wide interior room but …

Qanats and water stairs this is an ancient and very effective cooling method. 5 stories is no problem for such a system, it just effects how you design the room to room ventilation. A wind tower has o …

Sea shells are one of many other ways to make quicklime. you can roast sea shells in the same way you cook limestone and get the same results. Tabby concrete is made this way and it is what early Span …