Tiruenlveli

Tirunelveli is an ancient city, as evidenced by the findings of archaeological excavations which have been going on since 1840s, in the outskirts of the city in Adichallur (now under Tuticorin district). At this site, the archaeologists have unearthed an which could date back to 500 B.C containing a complete human skeleton and clay vessels with some rudimentary Tamil Brahmi script inscribed on them. Other ancient urns in which the elderly were buried have also been found in the same district. Along with skeletal finds, husks, grains of rice, charred rice and celts  have also been found.
More recent excavations at this site has led to the discovery of a habitation site of the Iron Age people. Archaeologists opine that it is about 3000–3800 years old, from the Neolithic period. This has assured us that Tirunelveli has been an abode for human habitation for 3000 years or more. Now,Adichanallur has been announced as an archaeological site for further excavation and studies.
The Pothigai Malai (hill), also known as the Agasthiyar Malai, is in the Ashambu hills, part of the Annamalai Hills in the southern part of the Western Ghats of southern India is in the Tirunelveli district of Tamil Nadu. Legend says that Sage Agastya (also written as Agasthiyar or Agathiyar) created the Tamil language here.. At 1,866 meters, it is the highest peak in the rugged Ashambu hills, which have one of the richest concentrations of biodiversity in the Western Ghats. The area is known for its spectacular views, beautiful forests and waterfalls, ancient temples and the river Tamirabarani, the lifeline of the region. According to the Mahābhārata, Lord Shiva sent the two saints (or sages) Vyasa and Agastya to create the divine languages Sanskrit and Tamil. Lord Murugan imparted spiritual knowledge to Agathiyar. Sage Agathiyar on the instruction of Lord Murugan originated the Tamil language. Agathiyar came to Pothigai and established the Tamil culture. The Tamil spoken in the Tirunelveli district is considered to be very pure. After establishing the Sidhar Gnana Koodam center for scientific research, and later traveling throughout the world spreading the knowledge gained, Agathiyar returned to a spot called Dashina Meru in the Pothagai hills, where he merged into the cosmos. A temple has been built for him at this spot, close to the Papanasam Falls on the banks of the Thamirabarani River. It is said that Sage Agathiyar occasionally gives appearances to sincere aspirants and devotees.