Not the tallest, but the most famous
The Sa Calobra is not the tallest climb on the island. That prize goes to Puig Major, accessed from the same road as the Sa Calobra. But due to this climb being a playground for pro cyclists in the off season, it is the most famous. Bradley Wiggins was rumoured to have spent all day riding up and down the Sa Calobra while preparing for his Tour de France win, and a look at the Strava leader board, below, shows no shortage of recognisable names. A good time for the Sa Calobra, for a decent amateur is 50 minutes. 25 minutes if your name is Ritchie Porte!
Visually spectacular
The road is an engineering achievement, against the odds, down a mountainside with no natural route down; the descent is technical but fast, with no two hairpins the same, which keeps you on your toes and covering the brakes. The 270-degree hairpin near the top is the highlight visually, and well worth a quick photo.
Two words of caution. Be careful of coaches on the ascent and descent, especially in tourist season and make sure you take enough water for the exposed top section if it's a hot day.