One of the most beautiful and majestic Catholic churches in Eastern Visayas is the Immaculate Conception Church in Guiuan, Eastern Samar. The Immaculate Conception Church was first built in the 1630s. Then during the 18th century, it was rebuilt using stones. Father Manuel Valverde further renovated the church starting in 1844. A new convent was erected in 1872. After the Second World War, a new rectory was built. The most awesome about the Immaculate Conception Church are the shells and corals that adorned the church, maybe the only one of its kind in the Philippines.
On July 31, 2001, the Immaculate Conception Church was one of the Philippine colonial churches declared by the National Museum as a national cultural treasure. The National Commission for Culture and the Arts had identified and selected it as one of 26 Spanish Colonial Era churches to be under its conservation program.