How big an object should I build on Earth so that it is visible from space?

I want to build a big structure that will be visible from space. A object would need to be very large, maybe kilometers across, to be visible from, let's say, the ISS (which orbits at an average height of 413 km above Earth).

How big would I have to build a non-light-emitting object, so that it is visible from space (the ISS) bare-eye?

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How big an object should I build on Earth so that it is visible from space?

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