The Caves at Ses Fontanelles
For those explorers amongst you, just before you reach the entrance to the bay, turn off to the right and drive up the camino (dirt track). You will have to park the car and continue on foot up the cliffs to the caves at Ses Fontanelles.
The walk is long, but the views from the cliffs are incredible. Remember to bring a torch if you want to see anything in the caves.
or
C'an Marça Caves
Breathtaking sea views as you descend steeply to the entrance. Enter this multi-level, yellow-gold world, plotting the smugglers' ancient route with a multilingual guide. Mysteriously, silently over eons, stalagmites and stalagtites have formed into figures, temples and rocket stations. At the heart is a spectacular Music & Light Show with a 30 ft. cascade of diamond-bright water. Tours hourly from 10.30 a.m till sunset. Open all year.