1. The Warsaw Old Town Market Square, also known as Rynek Starego Miasta, is a UNESCO World Heritage Site and one of the most popular tourist destinations in Warsaw. It is located in the heart of the Old Town and is surrounded by historic buildings and colorful townhouses. The square dates back to the late 13th century and was rebuilt after World War II. Some interesting facts about the Warsaw Old Town Market Square include:

- It is the oldest part of Warsaw and was named after the medieval marketplace that was once held there.

- The square is home to the famous Mermaid Statue, which is a symbol of Warsaw and the subject of many legends.

- The buildings around the square are built in different architectural styles, including Gothic, Renaissance, and Baroque.

- The square is home to many restaurants, cafes, and shops, making it a popular spot for both tourists and locals.

2. The Warsaw Old Town Market Square is open 24/7, although some businesses may have different opening hours. There is no phone number available for the square.

3. There is no admission fee to visit the Warsaw Old Town Market Square. The nearest metro station is Ratusz Arsenał, and there are also several bus and tram stops nearby. Taxis are also readily available in the area.