Built by Fatehpuri Begum, one of Shah Jahan’s wives, this 17th-century mosque is a haven of tranquillity after the frantic streets outside. The central pool was taken from a noble house, hence the elaborate shape. After the 1857 uprising the mosque was sold to a Hindu nobleman by the British for ₹19,000 and returned to Muslim worship in exchange for four villages 20 years later.