The Indian Botanical Gardens at Shibpur, near the Bengal Engineering College, is home of the largest banyan tree in the world (the banyan tree with the biggest girth), according to the Guinness Book of Records.
The first modernised post office was established in Calcutta in 1858.
South Point High School, Kolkata entered the Guinness Book of Records (from 1984 to 1992) as the school with maximum student enrollment.
The Calcutta Rajdhani Express was introduced in 1969 with a maximum allowed speed of 120km/h, which was then the new speed limit for trains in India.
Born into brothels, a documentary about the children of prostitutes in Sonagachi (Kolkata's red light district) won the Oscar award for the best documentary feature in 2005.
In 1795, two mahogany saplings were brought from West Indies and planted at Shibpur Botanical Gardens. They were the first mahogany trees grown in Indian soil.
Construction of India’s first subway system began in Calcutta in 1973. In 1986, the first section of the subway system, the first in India, was opened in the city.
Raja Sukhomoy Roy of Pathuria Ghata introduced the manual fan or man-pulled fan in Calcutta during Durga Puja celebration in his residence between 1784 to 1790 approximately.
In order to facilitate and ameliorate the transport system in Calcutta, Mini Bus started running on the streets of the city from 10th May,1972.
The Calcutta Medical College which was founded in 1835, is Asia’s oldest medical school.