Back in high school, I did an internship down in Center City, Philadelphia. Every day I'd walk from Market East Station to my internship a few blocks away towards the waterfront. On one of my first days down there, I noticed that free, Spanish-language newspapers were available along the street on the way to the internship. Having had five years of Spanish under my belt at that point but having little access to Spanish-language materials (the internet in 1997 wasn't quite what it is today), I'd always grab those papers and try to read them during my commutes, marking them up with my notes. I was down in Philly earlier this week, saw the same newspapers, and had to restrain myself from picking one up, if only because I can get much more (and likely exactly the same) content online.
The other interesting thing related to language learning about my excursion to Center City earlier this week was the foreign languages I heard: Mandarin, Spanish, and some other Chinese language (not sure which it was; I could pick out some words and phrases, but it clearly wasn't Mandarin). Mandarin was the one I heard the most, which might have just been a function of where I was; I was basically walking parallel to Chinatown a block or two to the south on Market Street. And Spanish was hardly in short order.
So although no one really thinks of Philly as a great place to go learn Mandarin or Spanish, it is (and long has been) easy to get exposure to both languages there (and to others as well, I'm sure). Just a few of the many of the ways you can increase your exposure to a target language without needing to go abroad.