1. St. John’s Archcathedral is a historic church located in the heart of Warsaw’s Old Town. It was built in the 14th century in Gothic style, but has undergone numerous renovations and restorations over the years. The cathedral is known for its beautiful stained glass windows and intricate artwork, including a magnificent marble altar and impressive paintings on the ceiling. In addition, the cathedral has played an important role in the history of Poland, serving as the coronation site for numerous kings and queens.

2. St. John’s Archcathedral is open daily from 6:30am to 6:00pm. The phone number for the cathedral is +48 22 831-02-94.

3. Admission to St. John’s Archcathedral is free, but donations are appreciated. The cathedral is easily accessible by public transportation, with several bus and tram stops located nearby. The nearest metro station is \"Ratusz Arsenal\" on the M1 line.