I've had several experiences like that when driving to Newhaven to catch the ferry. The approach road into Newhaven is like a roller coaster and you constantly drive in and out of pockets of thick fog. When it's dark it's really creepy. Not to mention stressful when there is some juggernaut up your backside, rushing to make the ferry.
We went to Folkestone to use the Eurotunnel recently. It was an evening crossing and I had heard that Folkestone has been regenerated and is a artsy and interesting place to be now, so we decided to go into the town for some dinner and have a look around before getting on the shuttle.
We ended up in some multi-storey car park which was like an island on a one way system, with a covered walkway linking it to the shopping centre on the other side. Going into the car park it felt like a scene from some post-apocolyptic movie, unkempt and really poorly maintained, it looked abandoned, with weeds everywhere. There was rubbish dumped all over the car park, it was clearly used as a sleeping place for homeless people and we were practically the only car in there.
While DH went to get a car park ticket I tentatively stuck my head through the door into the stairwell and OMG, it was like the worst sort of crack den. The window to the stairwell had been smashed in, bottles had been hurled at the walls of the stairwell, there was drugs paraphenalia lying around, blood on the stairs and the walls, fast food containers and leftover food chucked all over the floor, filthy clothes and sleeping bags strewn everywhere, vomit, piss, shit, you name it. We would have had to walk through that to get out the other side and I didn't dare call the lift and see what the state of that was - that's if it was even working, which I doubt.
I went straight back out into the car park and said to DH 'Don't bother. I'm not even leaving the car alone here for 20 minutes with all our stuff in it, let alone a couple of hours.' And we left.
So that, folks, is my abiding memory of Folkestone. I don't care what the rest of it is like, if it feels like a scene from a horror movie before I've even left the main car park then it's not for me thanks.