Tamizhagam, the Guest House of Government of Tamil Nadu was known as Arranmore Palace and was the property of his highness Maharaja of Jodhpur. Built in 1925 and sprawling across 36 acres, the Palace was purchased by Government of Tamil Nadu in 1958.

Located at about 2.8km away from Ooty Railway Station & Central Bus Stand, this elite Guest House is known for its vintage architecture, green lawns and royal rooms. The Guest House primarily meant for Government Officials on field duty provides excellent boarding and lodging facilities in The Nilgiris.

In the 100- Year old history of the Madras (now Tamil Nadu) Legislative Assembly, only once did the session take place outside Madras (now Chennai). In April 1959, the Tamil Nadu Assembly met at Arranmore Palace (now Thamizhagam Guest House) Ooty between April 20 to April 30, 1959. The ball room of the erstwhile Jodhpur Palace was improvised as the assembly chamber and seating provided to about 180 members of the Assembly, thus holding a historic place in the Tamil Nadu History.