Kolkata is probably the only metro city in India where many colonial-era bungalows are still intact. Several of them have fallen under the hammer of builders over the years, especially in the last decade or so. Such houses often have interesting memorablia that the owners have collected over decades, and want to sell off. This stash often lands up in the auction houses around the Park Street area. Once upon a time, there were many of these in Kolkata, like Mackenzie Lyall & Co. (set up in the 19th century and known for opium auctions); Dalhousie Exchange, Stainer & Co., and D Albert & Co. Over the years, most have had to shut shop, only a handful of the city's old auction houses remain.