The beautiful Halcyon Castle, also known as Kovalam Palace was built in 1932 by the regent, M.R. Sri Rama Varma Valiya Koil Thampuran, consort of Maharani Sethu Lakshmi Bayi as a perfect summer retreat for the whole family. During the 1960s it was sold to the Kerala government and is a luxury hotel today. It showcases the traditional Kerala architecture and style while the sprawling lawns are well maintained.
The Halcyon castle is also known as Kovalam Palace, as it is situated in the international beach resort of Kovalam in Trivandrum. The palace is now under the possession of Leela Group, which runs the 5 star deluxe hotel in Kovalam.