For the first time, visitors will be able to enter a hidden cell in the Medici Chapels where Michelangelo is thought to have covered the walls with sketches. Until some 40 years ago, no one realized that it existed.

And when curators discovered a secret room beneath the Medici Chapels in the Basilico di San Lorenzo in Florence, its walls covered in what appeared to be unknown sketches by the Renaissance master Michelangelo, they ordered it sealed to the public for conservation.