[3] The fauna and flora are very diverse,[4] with around 900 species of butterflies, as well as orchids, bats, etc., which are adapted to withstand extreme conditions of heat and drought.

[6] In 835, Drogon, the 40th bishop of Metz, brought back relics of Saint Quentin from Saint-Quentin en Vermandois.

This oratory was replaced by a sanctuary which served as a parish for several centuries for the inhabitants of Plappeville, Scy Chazelles, Lessy, and Longeville.

[7] From 1867 to 1870, the army transformed Mount Saint-Quentin into an entrenched camp in order to distance the front line and reinforce the military fortifications of Metz.

It consists of two main works, forts Diou and Girardin, linked by two connecting branches bordered by an artillery parapet.

The Metzer Zeitung, a Metz newspaper founded in October 1871 by the Lang brothers, launched a subscription to build this memorial.

During the Second World War, at the beginning of the Battle of Metz, a fire broke out on the nights of 31 August to 1 September 1994, in two of the three casemates of Fort Saint-Quentin where were stored the most precious documents of the Metz library collections: 588 manuscripts disappeared out of a total of 1,475 inventoried in the 1879 General Catalogue and its 1933 supplement, as well as 165 incunabula out of 614 volumes of incunabula (representing 781 bibliographic units).

[12] After a study phase carried out by the Établissement public foncier de Lorraine concerning the security of the site and the former military buildings, the Eurométropole urban community of Metz decided on 12 December 2005 to develop and secure the site to make it a place for walking and for the enhancement of the military architectural heritage and environmental protection.