What have you heard about the Dubai Metro? It's driveless and fully automated, that is very cool, isn't it? :) But what I liked most is that the 44 of its 47 stations are open and don't run underground. I compare the Dubai Metro with Moscow and St.Petersburg ones, where almost every station is deep underground. Because of the elevated stations it's very interesting to travel on metro in Dubai.
Here you can see some of the photos I made out of the metro train window:)