You can park at N50°27.700 / E004°52.118 or at N50°27.630 / E004°51.858
Why "the fragrance cache"?
As you will learn about the citadel, Guy Delforge creates his parfums in the Old Artillery laboratory (Also called Colombier Militaire and former Officer's Mess). You can visit his atelier.
www.delforge.com
The cache was/is filled with parfum samples. Just exchange them with other one's.