The heart of Madrid lends itself to walking so you can enjoy the center on foot. But if you're feeling even more adventurous, and want to venture farther afield, public transport is a vital part of your plan. In fact, Madrid has the second-longest metro system in Europe - London is the longest (and oldest). Rush hour in Madrid (07.30 – 09.00) can be crowded, and and beware of pickpockets at the touristy stations like Sol. Another option is the Hop-on, Hop-off bus, which runs a central route and one that goes out to the Bernabeu as well.