Nirmal Hriday (Pure Heart) was Mother Teresa's first home for the dying and destitute, established in 1952 in Kolkata. It remains the headquarters and标志性 institution of the Missionaries of Charity order she founded. The other options, Shishu Bhavan (children's home), Asha Sadan (hope center), and Shanti Nagar (city of peace), are also Missionaries of Charity institutions but serve different purposes and are not the headquarters.