Parts of Vancouver. There was a drug-related shoot out when we were there with 4 killed and, I think, 6 seriously injured.
Belfast...early 80's. Keep driving. Dont stop. Avoid the debris following a riot the night before. Also, the border with Eire on the same trip. Dont go in certain pubs. Dont speak to such and such. FFS dont let on you are from Britain.....the car reg was a bit of a give away though. Driving down a country lane, turned a bend, a gap had been cleared in a hedge and we were staring straight down the barrel of a light marching gun. It was (thankfully) the British army on patrol. Not a place to hang around.
Other dodgy places...northern part of what is now Namibia near the border with Angola, also in the early 80s. In the days when S Africa had invaded Angola to keep the Cuba-backed communists at bay. SA army were driving v-shaped armoured vehicles to reduce the effect of IEDs planted in the road. We had an Opel Kadett. All that for a bit of wildlife viewing.
Egypt...a coach load a Greek tourists were killed on the road to Giza from Cairo a week after I'd taken a school trip along the same road....mistaken for Israeli tourists. Outside Cairo we were driven in convoy by armed police everywhere. Bit like visiting Swansea🙂
Israel, near the border with Jordan and in Jerusalem when rockets had beed fired in the direction of. Again a school trip. A very tense time visiting the Western Wall. Armed people everywhere. Scared the students seeing so many firearms/protesters with banners screaming away through loudspeakers. There was trouble at the Al Asqa mosque, above the WW not long after and a siege at the church of the Holy Nativity which got shot up.
Back streets of Naples. Again with a school group when we had been dropped off miles from where we were going and took a wrong turn. Used syringes and dead dogs in the street. Leary locals watching us and you got the feeling any stragglers would be relieved of their possessions at knifepoint in daylight.
Northern Ethiopia near the border with Eritrea...we had an armed escort everywhere we went. Thankfully relations between the two countries have improved. Land mines were an issue if you strayed off the beaten track, too.