Thrithala is noted for its monuments and historic ruins and hence, has great archaeological importance. The ruins of a large mud fort with a deep moat hewn from laterite and the Siva temple are notable cultural monuments.

The Kattil Madom Temple, a domed structure made of granite slabs, on the Pattambi-Guruvayoor road is a Buddhist monument believed to date back to the 9th or 10th century. The temple probably marks the transition from the Chola to the Pandya style of architecture.

The Paakkanaar memorial, a tribute to the Pariah saint, stands near the Thrithala-Koottanad road. This is also the native place of renowned writer and social worker V. T. Bhattathiripad.