'There was a wild colloquial boy '...

This take off on the Irish song 'Wild Colonial Boy' just misses making my point. Here's the real point :) The thing I love to come across when I'm reading an international story is colloquialisms , sprinkled like sugar or spice through the content . It always interrupts the flow of my reading when I encounter a word or phrase foreign to me, and I love when it is explained further along by another character or even in a glossary at the back of the book or story. As a reader , I feel I have learned something new , no matter how min-ute, and for the author it is another way to plant the reader into the milieu of the work---location, culture, language.

Of course , you don't have to visit a country in person to pick up all these details . The Net is there for the asking. For example, just put into your browser: translate from English to Italian (Spanish, French etc etc) ______ word and see what comes up as pertains to the language you're researching. For locations, use Google maps for site and street views. For dress of the times , just put in the era and word 'clothing' and scroll down museum displays or prints of costumes of the times . Same with cooking. There was a great series on PBS from the 1980's called the Victorian Kitchen:

https://www.imdb.com/title/tt0817483/

which could be very helpful if you were writing about that period. Then plunk the various descriptors into your story to create a feeling of place and time. Don't overwhelm the plot by being too verbose in the endeavour , but a bit of international flavour always perks up a tale in my book :)