Notre Dame is Paris's most famous Gothic cathedral, the building that inspired Victor Hugo's Hunchback of Notre Dame. The exterior earns its reputation. The interior, less so.
Notre Dame is genuinely impressive Gothic architecture, and no one's saying don't go — we're saying don't go the way everyone else does. The real decision here is whether you join the line filing inside, or take the smarter position across the water on Île Saint-Louis and let the façade do what it actually does best. The interior has been described as gloomy, and a short walk to Sainte-Chapelle will give you a more beautiful church experience with stained glass that actually stops you cold.
Worth seeing, yes — but from the outside and from across the water on Île Saint-Louis, not necessarily from inside a queue. The exterior is the landmark; the interior has a reputation for being gloomy rather than grand.
Prices and access arrangements move — check current details before you go, especially given ongoing restoration work.
Walk the exterior, then cross to Île Saint-Louis for the best view of the façade from across the Seine. Pair it with Sainte-Chapelle nearby if you want the cathedral interior experience done properly.