Champakulam Kalloorkadu St. Mary's Syro Malabar Catholic Basilica

Established in AD 427, believed to be one of seven churches founded by Saint Thomas the Apostle in Kerala. It served as the mother church (Ammappalli) for all Syrian Churches in central Travancore. The church has connections with the Devanarayanans, kings of the Chempakassery kingdom. An ancient open-air rock cross on the grounds dates to AD 1151, and numerous rock inscriptions document the church's extensive history. The church played a significant role in ecumenical movements in the 18th century.

The church is the mother church of almost all Catholic Syrian churches in the Alappuzha district. It maintains traditional Syrian Christian practices and hosts the annual Feast of Mother Mary (Marian apparition) lasting 11 days ending on the third Sunday of October. The church participates in the Champakulam Moolam Boat Race, the oldest snake boat race in Kerala, held annually on the Pamba River in connection with the Ambalapuzha Sree Krishna Swamy Temple.