Considering the Eurobuilding 2 in Madrid?
A VT member wrote the following comment about visiting Madrid:
Madrid Vision bus tours by Nexus7
This is an excellent way to see the sights of Madrid in a rapid tour of a few hours. Then you can choose which sight you want to see and get off the bus and pick it up again later, as they circle around every half hour. There are also headphones with an audio tour of what you're driving by so you don't miss anything.