I’m not the biggest fan of skyscrapers... they’re cool and all but I don’t think they’re the best design option for cities...  They are most likely going to be unsustainable in the long run having more downside than upside.  However, I’m a big fan of the creativity and imagination they can spark.  Kids generally love them and well designed skyscrapers are generally fun to look at.  The National Building Museum in DC has a cool exhibit right now of LEGO skyscrapers and monuments.  Here’s the architect Adam Tucker with his collection of Chicago skyscrapers.  There are some amazing replicas.  

image: National Building Museum