A Mughal landmark. [Text and photos by Mayank Austen Soofi] Looming tall on a traffic circle, outside the Humayun Tomb complex, it is one of Delhi’s most overlooked monuments. The Mathura Road landmark is colloquially known as Neela Gumbad — for neela (blue) tiles adorn the dome. The 16th century building’s actual name of Sabz Burj comes from the sabz (Persian for green) tiles on its neck. Among the earliest Mughal monuments in India — older than even Humayun’s tomb — it has long been believed to be a tomb. Who built it and for whom has remained a mystery. We now have answers never reported before in the news media. Conservation architect Ratish Nanda of Aga Khan Trust for Culture, which executed an