Hope I'm not late to this party. Here are 3:
My first serious relationship was with a girl who lived on the other side of the country (USA). We met online when I was 16. This was before the Facebook craze so she had no social media to rely on whether she was a catfish or not. Me, in an act of stupidity and blind teenage love, saved enough money over a year that I bought a greyhound bus ticket just to see her. It actually went great and we ended up being together for 4 years, but the risks were high and I ignored them all.
Second was with a girl I met from Mexico. It wasn't so much that she was a problem, but she lived in one of the areas of Mexico where drug cartel violence was extremely common (shootings, buildings on fire, and there was a report once of a military helicopter getting shot down by an RPG). She wanted me to meet her parents, and of course, because I wanted to be the good boyfriend, I said yes. So I said good-bye to my parents, sweat is pouring down my brow as I'm death-gripping the steering wheel while crossing the border. Luckily, nothing happened, but there were people with assault rifles everywhere, and they weren't military personnel either; they had civilian clothing and most of them had some kind of jewelery encrusted on their rifles. My gf at the time kept warning me to not make eye contact.
Third is with my wife. We met online (I'm seeing a trend here...), but she lived in a Central American country. This time, I was legitimately scared that I was going to get there and someone was going to steal my kidneys (if you know where to look, there's lots of videos of people getting hacked to death with machetes in those countries). I even took a taser with me in my backpack just in case, but it got seized at the airport. It also didn't help that she lived in the middle of freaking nowhere in a jungle-ridden mountain range. Luckily, the only thing that happened was a nasty stomach bug I caught while j was there.
The things you do for love...