I love airports. The people watching there is just phenomenal.
I always get to my flight like 4 hours ahead of time just to sit in the busy concourse and watch the people. They're fascinating.
It's interesting to compare a European perspective with an American one.
In the US, the train stations I've seen range from unremarkable to downright filthy. The one station I found interesting was New York Penn Station, which I would favorably rate as on par with an average airport.
Trains and train stations on the other hand, even though I use them so regularly, are still super nice. I wouldn't say "exciting" but very nice.
That's why I'm so angry that the French government and railway company keep making trains and stations more and more like airports and airplanes.