As Sikhs across the globe celebrated Gurpurab Tuesday marking the birthday of their founder guru Guru Nanak Dev, Gurudwara Bangla Sahib located in Delhi’s busy Connaught Place continues to be one of the most famous Sikh sacred spots in India.Built in the 17th century, the marble shrine with its golden dome, topped with the iconic flagpole known as Nishan Sahib, was first owned by a Hindu Rajput ruler Raja Jai Singh. It was then known as Jaisinghpura Palace.