kengr

Actually... that's not a bad idea. Ok, lets say that the vessel had at least one person aboard when it arrived in the past. It wouldn't be unreasonable, if it was a planned incursion, that they'd do their research first.

So, they could arrive in lets say the victorian era with enough synthetic gemstones to be quite wealthy, and with a fore knowledge of events, parley that into a substantial fortune.

Now, they could purchase a warehouse, or some such open structure, and depending on the size of spaceship, park it there. Cover it in tarps, set up a trust fund to pay for maintenance of the building and some security, and you could quite easily leave it there for century or two. After a decade or two, no-one's going to question the existence of this old building, and if you've done your research so it's not in the way of any new developments, then it would easily remain undisturbed for a century or two. Especially in Europe or Britain.