I'm trying to think of either a famous cycling town, race or climb that begins with the letter "D" but I'm having problems coming up with any and google isn't much help either.
So I thought I'd open it up to the masses.
EDIT: I'm using the name as a codeword for a project I'm working on, so Dauphine it is. I've already had Alpe d'Huez, Big Bear Lake, Cairn O'Mount so far.