My School Days by Edith Nesbit

We were to leave Bagnères. Imagine my delight when I found we were to travel not by train, but in an open carriage. In this we were to drive through the mountains, the mysterious snow-clad mountains, into Spain, where the Alhambra was, and oranges and Spanish nuts, and all sorts of delightful things. But alas for my hopes! My brother at home in England chose to have whooping-cough, and so our horses' heads were turned north, and farewell for ever to my visions of Spain.

We drove through lovely country to the other Bagnères, Bagnères de Luchon. On the way we passed a large yellow-stone castle on a hill. Most of the castle was in ruins, but a great square tower, without door or window, still stood as strong and firm as on the day when the last stone was patted into place with the trowel. We wandered round this tower in vain, trying to find a door.