Nanded is where the line of living Gurus ended, and if the tradition's account is right it is the most consequential place in Sikh history after Amritsar.
1708
Guru Gobind Singh died at Nanded on the Godavari in 1708, of wounds inflicted by an assassin.
Before dying, he is held to have declared that there would be no further human Guru, and that the Guru Granth Sahib, the scripture, would be Guru thereafter.
What that means
If the account is accurate, this is the point at which Sikhism became a religion governed by a book rather than by a person.
The consequences are visible in every gurdwara in the world. The Guru Granth Sahib is not treated as a text about the Guru; it is treated as the Guru. It is installed on a throne under a canopy, attended with a whisk, put to rest at night in a separate chamber and brought out in the morning, and decisions are sought from it by opening it at random.
There is no clergy with interpretive authority over it, no pope and no council, because the scripture holds the office that a person would otherwise hold.
That makes Nanded load-bearing out of all proportion to how often it is visited, and it is visited far less than Amritsar.
Different practice
Worship at Hazur Sahib is markedly different from Punjab's. It retains older usages, including the use of weapons in worship, arti with lamps, and practices that Punjab-based reform movements pruned elsewhere.
The reason is geography. The reform movements of the early twentieth century, the Singh Sabha and the Gurdwara Reform Movement, standardised Sikh practice in Punjab and produced the statutory committee that enforces it. They did not reach Maharashtra.
Whether the usages at Nanded are ancient survivals that Punjab lost, or later local accretions that Punjab never had, is argued within the community, and Punjab-based bodies have periodically objected to them. It is not a question the evidence settles cleanly.
The building and the board
Maharaja Ranjit Singh built the present gurdwara between 1832 and 1837.
It is administered by its own board under Maharashtra legislation, not by the SGPC, one of the two takhts outside the Punjab committee's jurisdiction, and a further reason the question of who speaks for Sikhs has no settled answer.