Fodor's Expert Review Mirador Torre de Collserola

The Collserola communications tower was designed by Norman Foster for the 1992 Olympics. An industrial spike on an otherwise pristine wooded skyline, it was not universally admired. A vertigo-inducing elevator ride takes you to the observation deck on the 10th floor. Take the FGC S1, S2, or S5 line to Peu del Funicular (note that the cars at the front of the train don't open at this station), then the funicular up to Vallvidrera; from the village of Vallvidrera it's a pleasant walk to the tower. Ongoing renovations have led to the tower being closed, so check the website before you go.