Entrance to Adilabad Fort, Tughlakabad, New Delhi - stock photo

It's one of the lesser known of the many forts dotting the Capital's landscape. Delhi may be known as the city of tombs and forts, but this 14th century edifice located in the outskirts of the city lies neglected and almost forgotten.Built by Mohammed-bin-Tughlaq, Adilabad Fort is referred to by historians as the fourth fort of Delhi, in the footsteps of famous contemporaries like Red Fort, Old Fort and the adjacent Tughlaqabad Fort. But despite being under the protection of the Archaeological Survey of India (ASI), Adilabad Fort remains a rare, hidden treasure of Delhi with very few people even aware of its existence.