I've only been abroad one time, and there were little gecko/lizard things everywhere, climbing up walls and scurrying across roads, and nobody cared. I was constantly fascinated but to the locals they're just kinda there.
Bonus question to anyone who visited the UK - was there anything that fascinated you but I'd be taking for granted?
To answer OP's question, I'm American but spent a few years in the UK. Things that fascinated me included:
How green it is (being from Texas this was the first thing that stood out to me)
The shear amount of history that is just everywhere (I remember eat lunch at a park and reading a sign about how it was the site of a huge battle during the war of the roses)
Pubs (man I miss going to my local. We really don't have 3rd places in the US anymore)