1. St. Paul’s Cathedral is a famous Anglican Cathedral located in the heart of London. Its impressive dome is one of the largest in the world, standing at 111 meters. The cathedral was designed by Sir Christopher Wren, one of the most famous architects in English history. It took 35 years to build from 1675 to 1710. The cathedral has been featured in many famous works of literature and art, including the famous novel by Charles Dickens, \"Great Expectations.\" The interior of the church boasts of beautiful mosaics, paintings, and stained glass windows.

2. St. Paul’s Cathedral is open to the public from Monday to Saturday, 8:30 AM to 4 PM (last admission at 3 PM). They are closed on Sundays and for special events. You can contact them at +44 20 7246 8350.

3. The cathedral offers different types of tickets, from individual tickets to group and family tickets. A standard adult ticket is £20, while children aged 6-17 can enter for £8. Children under five can enter for free. Visitors can also buy a guided tour, which comes with an audio guide. It is best to book your tickets in advance online. The nearest tube stations are St. Paul’s station (Central line) and Mansion House station (District and Circle lines).