16. St Paul’s Cathedral
The St Paul’s Cathedral in London is another magnificent church that is worth a visit in this European city. Considered as the mother of the church of the Diocese of London, the church sits at the highest point of the city. It was dedicated to St. Paul the Apostle and was founded in 604 AD. There are admission fees for people who want to visit the church for sightseeing. However, worshipers are free to enter. During Sundays, the church is open only for services and not for sightseeing tours.
Image Credit: Boomsbeat