1. Lille Cathedral, also known as Cathédrale Notre-Dame-de-la-Treille, is a stunning Gothic cathedral located in the city of Lille, France. Interestingly, the cathedral was not completed until 1999, despite its construction beginning in 1854. This long construction period has resulted in a unique blend of architectural styles, combining traditional Gothic elements with more contemporary features.

The facade of Lille Cathedral is particularly striking, with its intricate stone carvings and impressive rose window. Inside, visitors can admire the beautiful stained glass windows and ornate decorations. The cathedral is also home to a magnificent organ, which is often used for concerts and recitals.

2. Lille Cathedral is usually open to visitors from Monday to Saturday, with varying opening hours. It is recommended to check the official website or contact the cathedral directly for the most up-to-date information. Unfortunately, I do not have a current phone number for the cathedral.

3. Admission to Lille Cathedral is typically free of charge. The cathedral is easily accessible by public transportation, with several bus and metro stops located nearby. Additionally, there are parking facilities available for those arriving by car. Overall, Lille Cathedral is a must-visit destination for anyone interested in history, architecture, or religious sites.