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  1. architecture - Tallest building possible by the Roman Empire ...

  2. Could a supertall building have been built in the 18th century?

  3. Massive Medieval structures - Worldbuilding Stack Exchange

  4. The 10,000 year skyscraper - Worldbuilding Stack Exchange

  5. Architectural feasibility of a tiered circular stone keep

  6. What factors determine how tall the buildings in a city will be?

  7. In modern world, what is the largest building that could be built ...

  8. Could extremely tall towers be held up by balloons so that they …

  9. science based - What is the tallest mountain possible in any ...

  10. science based - Practical height of towers without elevators ...