Stage 4 of the Giro will happen on May 12th and the stage I'm most looking forward too. Why? Because it's the Team Time Trial (TTT). Basically, 1 team member pulls and everyone else drafts off of him and rotate. There's teamwork and strategy in the other stages, but nothing like the TTT. It requires the entire team to be in sync. One false move can cost the team, and team leader, valuable seconds and those seconds can decide the winner of the tour. Another reason to watch are for the beast TT frames.
Stage Details
Distance: 32.5km
Vertical Climb: 250m
Highest Point: 537m
Terrain: Stead Climbing
Category: Team Time Trial
Images from here.