The Vimalagiri Church, also known as the Immaculate Heart of Mary Cathedral, is one of the most prominent Christian pilgrimage sites in Kottayam, Kerala. Built in the Gothic architectural style, the church stands out with its towering 172-foot spire, making it one of the tallest church towers in Kerala. Locally referred to as Angathattu Palli, it serves as the Cathedral of the Diocese of Vijayapuram and is a significant landmark in the region.

Every December, the church hosts its annual feast, attracting pilgrims from across Kerala. The stained glass windows, intricate interiors and towering spire add to its architectural grandeur, making it a spiritual and visual marvel. Situated in the heart of Kottayam, Vimalagiri Church not only stands as a center of faith but also as a symbol of the region's deep-rooted Christian heritage.

Established on July 14, 1930, the Diocese of Vijayapuram is part of the Latin Rite and covers an extensive area of 9,000 square kilometers across Kottayam, Idukki, parts of Alappuzha, Ernakulam, and Pathanamthitta districts. Originally a part of the Metropolitan Archdiocese of Verapoly, the diocese was formed to accommodate the growing Christian population due to various migration waves from Kochi, Kollam, and Tamil Nadu.

The diocese's history is closely linked to Carmelite missionaries, particularly Bro. Rocky Palackal, who played a key role in its establishment. The administration was initially led by Spanish bishops, before transitioning to Indian leadership in 1971. Kottayam, which serves as the headquarters of the diocese, is also home to various Christian denominations, including the Knanaya Church, Malankara Orthodox Church, Syrian Church and Jacobite Church.

With its cultural richness, historical significance, and spiritual prominence, Vimalagiri Church and the Diocese of Vijayapuram continue to be pillars of Christian heritage in Kerala, drawing both pilgrims and history enthusiasts alike.