A day at Massa-Carrara province and the Fantiscritti marble quarry where Michelangelo spent months selecting the marble he'd use.  The David marble slab came from this quarry, though it was selected by someone else decades earlier and later discarded as useless until Michelangelo decided otherwise.

These marble quarries very near Lucca look, from a distance, like snow-capped mountains.
    Here's an interesting page of marble crystal samples from Fantiscritti Quarry.

We had to go through the longest tunnel I've ever experienced (it seemed never-ending and was a bit scary) to get to this quarry.   Also visited the city of Carrara of course.