If that place it was taken from does not have the capacity to store it you should still return it, whatever cultural significance you attach to it means nothing against it's original cultures claim to the artifact. Especially if it's someplace like the British museum, who in the past have decided such culturally important artifacts should be scrubbed with the likes of a stiff metal wire brush and chemicals, thus permanently damaging such artifacts. Not to worry though, if you can ever scrape together enough money to travel to the UK you too can pay to see your artifact, assuming it's among the few thousand on display and not part of the 8 million objects locked up in the basement forever.