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  • $\begingroup$ I like the idea of the rockets. If the goal is only to awe future civilizations, maybe the craft spend the majority of the 10,000 years in orbit and then comes crashing down just before the future civilization arrives. Add a couple parachutes and a bit of hand waving and you can even get it to stand on end and be massively tall. $\endgroup$ Commented Nov 2, 2016 at 14:43