1. St. John's Archcathedral (Archikatedra Sw. Jana) in Warsaw is one of the oldest churches in the city, with a history dating back to the 14th century. The cathedral is considered one of the most important landmarks of Warsaw, known for its impressive Gothic architecture and historical significance.

The cathedral has survived numerous wars and invasions throughout its long history, including being severely damaged during World War II and later reconstructed. Inside, visitors can admire the stunning interior with its beautiful stained glass windows, intricate stone carvings, and ornate altars.

2. The working hours of St. John's Archcathedral can vary, so it is recommended to check the official website or contact the cathedral directly for up-to-date information. Unfortunately, there is no available phone number provided.

3. Admission to St. John's Archcathedral is usually free, but donations are appreciated to support the maintenance of the historic site. The cathedral is located in the heart of Warsaw's Old Town, making it easily accessible by public transportation such as buses and trams. Visitors can also reach the cathedral on foot or by taxi.