Paris... during the 90s when the peso was 1:1.
Last time it was “more” expensive was between 2015-2018/19 when there was no real difference between the blue and official - a $20 meal was a $20 meal. You could just use your foreign credit or debit card as if it were a local one and the only thing to worry about was the fees charged by your home bank. Obviously on the whole it was still cheaper than major cities in the US or EU but there were many things that were much more expensive than in Europe (eg food, clothes and consumer items etc)
If memory serves me right, there was also a strange few months around 2013-2014ish when suddenly a cup of coffee in BA was more expensive than in London.