Sacre Coeur is located in Montmartre area. Easiest way to get up the hill is with the Funicular, which is its own experience. You can also climb the stairs right next to it. You see beautiful views towards the city center from the top of the hill, in front of Sacre Coeur. The Basilica is beautiful outside. You won't be allowed to take pictures inside, but it's free to enter and it's lovely inside. If you wish to climb up to the top of Sacre Coeur or see the crypts, you need to pay.
The only downside with this attraction is that it's always crowded on the hill, and it's filled with street vendors, who can be pushy and try to scam you. But if you don't let them bother you, you should be fine to enjoy the Sacred Heart and the views.
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