Situated in the Panchkula district just adjacent to Chandigarh, is the temple of the Maa Mansa Devi. The temple complex is spread of 100 acres of the Shivalik foothills in village Bilaspur, near Mani Majra, and Panchkula.
The shrine is an epitome of age old tradition of ‘Shakti’ worship in Northern India. According to the Hindu mythology, the forehead of Devi Sati fell here.
According to another story, in the Shivalik Hills, a cow used to arrive every day and offer milk at 3 adjoining stones (Pindies) places on hilltop. It was observed by local resident that’s there were 3 Holy Shilas originated and they started Worshiping & accordingly a temple was constructed finally.
Navratra festival is celebrated in the mandir twice a year in the month of Ashvin (Shardiya, Sharad or Winter Navratra) and other in the month of Chaitra, Spring Navratra.
Lakhs of devotees pay obeisance during the Navratra mela and temples remain open throughout the day. These melas are of 9 days duration each time and concludes on the 9th day.
Source
https://en.wikipedia.org/wiki/Mata_Mansa_Devi_Mandir
http://mansadevi.org.in/mansa-devi-temple/
http://www.discoveredindia.com/chandigarh/attractions/temples/mansa-devi-temple.htm
http://www.templesofindia.net/sites/default/files/2016-11/Mansa_Devi_Temple-2.jpg
Later, Maharaja Gopal Singh of Mani Majra constructed the present main temple of Shri Mansa Devi, during the period 1811–1815. At a distance of 200 meters from the main temple is the Patiala temple which was constructed by Karam Singh, a Sikh, the then Maharaja Patiala in the year 1840. This temple had the patronage of Manimajra Princely State.
Of the two temples present in the temple complex, the main temple is dedicated to Goddess Mansa. Devi Mansa is worshipped along with Devi Saraswati and Lakshmi in the sanctum sanctorum. While Goddess Mansa is worshipped in the ‘pindi’ form as well as the anthropomorphic marble idol form, Devi Saraswati and Lakshmi are worshipped in the form of stone pebbles or the ‘pindi’ form. The marble sculpted form of Devi Mansa was created in recent times to give it a more human form but earlier, the Devi’s were traditionally worshipped in the form of pindis by devotees.