Notre Dame reopened December 2024 with mandatory timed entry slots, and it's actually brilliant for crowd control. Free 15-minute time slots available up to 2 days in advance through the official Notre-Dame de Paris website — No third-party booking fees.

Thursday and Friday evenings around 8:30pm are absolutely magical. Cathedral stays open until 10pm those nights, crowds thin dramatically after 8pm, and the interior lighting creates this gorgeous amber glow on the restored stonework. You can actually move around freely and appreciate the craftsmanship without being pressed against other visitors.

Without a reservation during peak summer months, expect 2-3 hour waits in direct sun. The new booking system post-restoration caught many guidebooks off guard, so this isn't widely known yet.

While you're on Île de la Cité, absolutely don't miss Sainte-Chapelle just 200 meters away. Those 13th-century stained glass windows — 1,113 individual scenes depicting biblical stories — Are arguably more spectacular than Notre Dame's rose windows. Most visitors skip it entirely because it's tucked inside the Palais de Justice complex. Entry is €11.50, but the light filtering through that glass will genuinely take your breath away, especially around 4pm when the western sun hits the windows directly.