My fiancé and I decided we would not use the K1 visa as we were not quite ready to get married.
It has now expired, but before it did, we told the embassy we were not using it, and the embassy said that we could send the K1 pack back to them which we did by registered post.
I asked whether they also needed my passport to cancel the visa - or to put some sort of stamp on it to say the visa is not going to be used. They said no, as the visa was due to expire in a few days and I wasn't travelling before it expired.
So, my question is, can I enter the USA on an ESTA for a holiday, so I can visit my daughter who is a US citizen? I do have a lot of travel history to the USA under ESTA (about 16-18 trips on my current passport over the last 5 years), though there is an expired K1 visa on my passport now.