With two tehsils with similar names in the same state, it is easy to get lost. Thankfully, the district names are different.
Laxmangarh, Alwar district, Rajasthan
The Gazetteer of Ulwar mentions that
the old name of Lachhmangarh was Taur. Partap Singh got possession of the place from Sariip Singh, and enlarged the fort and renamed it Lachmangarh. The
fort subsequently endured a seige laid by Najaf Khan.
More information about the history around the district is available at: http://alwar.nic.in/history.html
The walls and bastions are barely visible on Google Maps and Wikimapia. The fort would hardly be recognizable if the moat was not as prominent in the center of the town. I would not be surprised if even this sign of a fort is covered up and gone in the decades to come.
On the ridge south-east of Laxmangarh are two more structures that look like fortifications.
Laxmangarh in Sikar district
More info at: http://en.wikipedia.org/wiki/Laxmangarh