Udayagiri Fort is a dilapidated fort in Thuckalay town in Kanyakumari district of Tamil Nadu. It was built as an additional barracks for the Travancore kingdom during 18th century. Inside, the fort was an old foundry for casting canons.
There is a secret tunnel from the fort. It aslo houses the Dutch Admiral Eustachius De Lannoy tomb. Now, the fort campus is used as a bio diversity park by state government of Tamil Nadu.
One can see rabbits, eagles, monkeys, peacock and other small animals here.
As regards to fort, one can see only the few remaining structure of the fort. The whole fort enclosure spreads across 90 acres.