The route they take vary a little from year to year, so steepest climb may also change. One side of Col du Tourmalet has a 14% incline which is an absolute killer to ride.

Cime de la Bonette 2802 metres. Most recently used in 2008 when John Lee Augustyn was first over the summit... then proceded to crash about 1km into the descent.

Highest stage finish ever was the Col du Granon near Briancon. 2404m. Only appeared once, in 1986.

The cast of The Du Pont Story - 1950 includes: Art Baker as Chemical Director Whit Bissell as Dr. Wallace Carothers David Bruce as A young du Pont Nana Bryant as Elizabeth du Pont Sigrid Gurie as Sophie du Pont Stuart Holmes as Dr. Alexis du Pont Ted Jacques as Amory Askell Marcel Journet as Col. Louis de Toussand Douglas Kennedy as Coleman du Pont Charles Lane as Lammot du Pont James Millican as Alfred I. du Pont John Morgan as Francis C. du Pont Tom Neal as Alfred V. du Pont Peter Ortiz as Charles I. du Pont Vincent Pelletier as Narrator Marshall Reed as Hamilton Barksdale Grandon Rhodes as President Thomas Jefferson Keith Richards Stanley Ridges as Gen. Henry du Pont Edmon Ryan as Lammot du Pont - the elder Walter Sande as Tom Cooper Lyle Talbot as Eugene du Pont Pierre Watkin as Col. Henry du Pont

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This is hard to answer since the question is a bit unclear but I'll go for the largest ski resort in the west of the big skiing countries.

France: west would be the Pyrenées where the largest resort is Domaine Tourmalet.

Austria: in the west bordering to Switzerland is the Silvretta Arena.

Italy: in the west bordering to France is Via Lattea.

Switzerland: in the west bordering to France is Les Portes du Soleil