Some people make a pilgrimage to Colmar with the sole purpose of visiting the great Musee d'Unterlinden.
The Musee d'Unterlinden is a very crowded and popular tourist attraction. 
mnli hypothesis: The Musee d'Unterlinden is a very crowded and popular tourist attraction.  premise: Some people make a pilgrimage to Colmar with the sole purpose of visiting the great Musee d'Unterlinden.