Thangasseri fort is situated in Kollam district. It was also called as ‘Dutch Quilon’. The word meaning of Thangasseri is ‘gold village’ as this was the place where trade was done using gold as the currency. This place was the favorite spot of the Dutch and the Portuguese. The fort was built in the 16th century and at present only the ruins are left behind. It was about 20 feet tall. At present, this fort is managed by the Archaeological Survey of India.