One of the oldest temples in the State, the Vadakkumnathan Temple is a classic example of the Kerala style of architecture and has many decorative murals and pieces of art. This is the venue of the world famous Pooram festival celebrated annually. The fireworks at the Pooram are a spectacular sight. This temple is a classic example of the Kerala style of architecture. The temple contains the sacred shrines of Paramashiva, Parvathy, Sankaranarayana, Ganapathy, Sri Rama and Sri Krishna. The central shrines and Koothambalam exhibit exquisite vignettes carved in wood. Legend goes that this temple was founded by Parasurama.This temple is a classic example of the architectural style of Kerala and has monumental towers on all four sides and also a kuttambalam. Mural paintings depicting various episodes from Mahabharata can be seen inside the temple The shrines and the Kuttambalam display vignettes carved in wood. The temple, along with the mural paintings, has been declared as a National Monument by India under Ancient Monuments and Archaeological Sites and Remains Act. According to popular local lore, this is the first temple built by Parasurama, the sixth incarnation of Vishnu. Tekkinkadu Ground, encircling the Vadakkunnathan Temple, is the main venue of the Thrissur Pooram.In the year 2012 Archaeological Survey of India (ASI) has recommended 14 sites, including Vadakkumnathan Temple and palaces, from Kerala to include in the list of UNESCO World Heritage Sites.