1. Kolkata has a place known as Sonagachi which is Asia's largest red light area. It is a licensed place and is home to more than 11,000 sex workers.
As of 2006, Kolkata had no "Kolkata" station.
Howrah Junction in Kolkata is the busiest junction in the country, with 974 trains stopping daily in Howrah.
The Botanical Garden of Kolkata boasts the largest tree in the world, a huge banyan tree with a circumference of over 330 meters.
The National Library of India, located in Kolkata, is the largest public library in the country.
Calcutta may not be a city of princes, but the Calcutta Polo Club is the oldest in the world.
Apart from Kyoto and Tokyo, Kolkata is the only Asian mainland city to have six Nobel Prize winners - Mother Teresa, Amartya Sen, Abhijit Bannerjee, Rabindranath Tagore, C.V. Raman and Sir Ronald Ross
Established in 1898, the Calcutta Football League is the oldest football tournament in the country, and the second oldest in the world.
Kolkata is the only city in India that has hand drawn rickshaws.
Kolkata's Howrah Bridge is the sixth largest cantilever bridge in the world and the only one in India.
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