The Cathedral Notre-Dame of Luxembourg, a stunning example of Gothic and Renaissance architecture, is easily accessible in Luxembourg City, generally offering wheelchair access to its main floor. Entrance is typically free, though donations are appreciated, and a visit usually lasts 30 minutes to an hour. It can be explored independently, allowing visitors to admire its intricate stained glass windows and peaceful atmosphere at their own pace, or included as part of a guided city tour. While open year-round, it's advisable to check its official website for specific opening hours, especially around holidays or during special services, and visitors should dress respectfully as it remains an active place of worship.