Largest Church in the world

St.Peter's Basilica, Vatican City

The church is built on Vatican Hill, across the Tiber river from the historic center of Rome. The location is highly symbolic: this was the site where Saint Peter, the chief apostle, died a martyr and where he was buried in 64 AD. St. Peter is considered the first pope, so it made perfect sense for the papacy to build the principal shrine of the Catholic church here.

Basilica Of The National Shrine Of Our Lady Of Aparecida

The Roman Rite feast day of Our Lady of Aparecida is on October 12, which since 1980 is also a public holiday in Brazil. The building in which it is venerated was granted the title of minor basilica by Pope John Paul II in 1980, and is the largest Marian shrine in the world, being able to hold up to 45,000 worshippers.

Seville Cathedral, Seville, Spain

The cathedral stands on the site of what was –in the 12th century– the Great Mosque. Today, the only part which remains of this structure is the minaret, also known as the Giralda due to the weather vane added to the top in the 16th century. The Abluciones courtyard and today's Puerta del Perdón door are also parts of the old mosque.

Sources : en.wikipedia.org