Once visit Shanghai is not enough.

只来一次上海是不够的。

youdao

Torrey says he was lucky to visit it not once,but twice, at the June and December solstices.

VOA: standard.2009.12.15

I once went to visit the summer palace that he created and that Nicholas II loved so much there.

我曾到过他修建的夏宫看过,据说尼古拉二世特别喜欢那个地方

耶鲁公开课 - 欧洲文明课程节选

Do come and visit once a while.

有空过来看看。

哈佛公开课 - 幸福课课程节选

Once you visit a place, you can then return using a fast travel mode that gets you there without incident, but it does use up the same in-game time as if you had walked there.

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Once registered, visit A History of the World in Norfolk and click on 'Add an Object'.

BBC: Preview: A History of the World shows Norfolk treasures

I'd only been outside of Europe once, to visit the United States.

WSJ: Marcus Samuelsson on Traveling to Japan to Eat Fugu | Traveler's Tale