Amiens has suffered quite a lot during the two world wars; 60% of the city centre was destroyed at the end of WWII, with only the district of Saint-Leu on the banks of the river Somme and the cathedral having survived the bombings. The rest of the town has been rebuilt with a focus on widening the streets to ease traffic and is as such not particularly engaging.
But as in Chartres most people who come to Amiens actually come to see the cathedral and rightly so. A fire in 1218 destroyed the original Romanesque cathedral but the edifice was quickly rebuilt between 1220 and 1270 in high gothic style, benefiting from the experience gained in Chartres and Reims and achieving a strong unity of style. After heavy damages to its statuary during the French Revolution an important campaign of restoration started in the 19th century, particularly under the aegis of Viollet-le-Duc.
However, if you have time on your hands we would like to recommend two enjoyable museums: the Musée de Picardie newly renovated and well worth-seeing for its collection of medieval art, paintings and its hall of sculptures and the Musée Jules Verne displaying many interesting memorabilia and background on the life and work of the French author who lived a big part of his life in Amiens. And of course, a visit to Amiens would not be complete without touring the hortillonages, 300 hectares of marshes which have been transformed into fields interlaced with 65km of small canals in the Middle Ages in order to supply Amiens and its surroundings with vegetables.
While researching the cathedral, I came across this website, unfortunately only in French but very informative.
$updated from: Cathedral Cities.htxt Sun 13 Dec 2020 16:00:13 trvl2 (By Vero and Thomas Lauer)$