Kolkata: The moment one steps into Basu Bati, a 141-year-old mansion, an eerie feeling creeps in with its dark, deserted rooms flanked by stately columns and arches creating an ambience horror. No wonder, the building, located in Baghbazar in north Kolkata, has become the favourite shooting spot for thriller and period movies. Basu Bati, founded by the Basus (not the painter Nandalal Bose family), the then zamindars of Gaya in the 19th century, had guests like Swami Viveknanda, Rabindranath Tagore and was a rallying point against the 1905 anti-partition movement. Just Saturday, the trailer launch of the film "Shob Bhooturey" took place at the building and director Birsha Dasgupta said he was very impressed by the atmosphere. The mansion earlier hosted director Srijit Mukherjee whose much-acclaimed "Baishe Srabon" was shot there.