Tourists irrespective of their varied interests, have one thing in common i.e. they would like to go around heritage monuments which are in plenty in Tamil Nadu,
A) THE CHOLA TEMPLES
The Great Living Chola Temples constructed by the king Raja Raja Chola and his son Rajendra are sites of glorious heritage and architectural achievements. The Cultural heritage site includes the three great temples of 11th and 12th century namely, the Brihadisvara Temple at Thanjavur, the Brihadisvara Temple at Gangaikondacholisvaram and the Airavatesvara Temple at Darasuram. The temples testify to the brilliant achievements of the Chola in architecture, sculpture, painting and bronze casting.

• Thanjavur - The home to the Chola Kingdom and the location of the Brihadisvara Temple built in the 11th Century. The temple made with 130,000 tons of granite is the tallest in South India and has been built in such a way that the shadows of the gopuram and its pillars do not fall on the ground any time during the day.
• Gangaikonda Cholapuram - The capital of the Chola kingdom for 250 years. The Temple of Gangaikondacholisvaram, located here and built by Rajendra I, was completed in 1035. Its 53 metres (174 ft) vimana (sanctum tower) has recessed corners and a graceful upward curving movement, contrasting with the straight and severe tower at Thanjavur.
• Darasuram - A small town close to Kumbakonam, the town has the prestigious Airavatesvara Temple dedicated to Lord Shiva along with the Brihadeeswara Temple and the temple of the Gangaikonda Cholapuram are three of the most venerated and architectural legacies of the Chola empire.

B) GROUP OF MONUMENTS IN MAHABALIPURAM
The Group of Monuments at Mahabalipuram declared as a WHS  in Tamil Nadu, about 58 km from Chennai, were built by the Pallava kings in the 7th and 8th centuries. The town is said to have gained prominence under the rule of Mamalla. These monuments have been carved out of rock along the Coromandel Coast. These monuments surprisingly survived the 2004 Tsunamithat devastated the other coastal towns nearby. The following monuments are the group of monuments at Mahabalipuram

• Ratha Temples : Temples in the form of chariots.
• The 11 Mandapas : Cave sanctuaries dedicated to various deities.
• Rock Reliefs that include Descent of the Ganges and the Arjuna's Penance.
• The Shore Temple and the other temples cut out of rock.
• The Seven Pagodas

C) THE NILGIRI MOUNTAIN RAILWAY
Part of the Mountain Railways of India, the Nilgiri Mountain Railway(NMR) was stated to be an "outstanding examples of bold, ingenious engineering solutions for the problem of establishing an effective rail link through a rugged, mountainous terrain." The Nilgiri Mountain Railway was added to the list of World Heritage Sites in 2005.
The Route is a scenic beauty throughout passing through the various terrains and thickly forested areas of the Nilgiri Mountains. The route consists of the following stations:

Mettupalayam, Kaalar , Hillgrove,Runneymede,Kateri Road,Coonor,Wellington,Aruvankadu,Ketti,Lovedale,Ooty