Mother House, the headquarters of the MOC, was Mother Teresa’s home for 44 years during her time in Kolkata, and visitors come here to pay respects at her tomb. The room where she slept has been preserved, and you can look in on the simple camp bed where she slept. A photo above the bed shows her meeting with Pope John Paul II in 1986, 11 years before her death in 1997. The neighboring museum houses her threadbare sandals and chipped ceramic bowl.
Since Mother House is still a working missionary center, visiting hours are strictly adhered to, so double check the latest times before you head over. If you want to dig deeper and really get a sense for the work being done, consider volunteering for a day or two during your visit to Kolkata.