Halt at Muhassab is not something (significant from the point of view of the Shari'ah). It is a place of halt where Messenger of Allah (way peace be upon him) halted. (Using translation from Muslim 1312)
«إِنَّ الْمُحَصَّبُ لَيْسَ بِشَيْءٍ إِنَّمَا هُوَ مَنْزِلٌ نَزَلَهُ رَسُولُ اللهِ ﷺ»