Bahadurgarh fort, about six kilometres from Patiala, was built in the seventeenth century by Nawab Saif Khan and rebuilt by Maharaja Karam Singh of Patiala in the 1830s. It is a circular fort with a moat, unusual in Punjab.
Guru Tegh Bahadur Ji stayed here for about three months on his way to Delhi in 1675, and Gurdwara Sri Guru Tegh Bahadur Sahib is inside the fort.
It housed the National Security Guard's training centre for a long period, which is the same pattern as Gobindgarh: a historic fort preserved because a security force occupied it.
Punjab's forts have generally survived in proportion to how useful they were to a later army. The ones that were not useful, at Batala, at Bahadurgarh's smaller equivalents, at the misl seats, are gone.
There is no inventory of Punjab's fort sites and no condition survey of the ones that remain.
The fort is circular with a moat and was rebuilt in the eighteenth century by Patiala state, which gave it the name it now carries.
The gurdwara inside marks the Guru's stay. The rest of the complex has been in institutional use for decades and is not open.
Punjab has fort sites at Bathinda, Phillaur, Anandpur, Faridkot, Patiala, Bahadurgarh, Nabha, Jagraon, Ropar and a long list of smaller places. No department holds a list of them.