Most of the buildings people search for have a free side and a paid one. The free side is the photograph from the square. The paid one is usually a roof, a terrace, or a deck, and it is the visit. Milan’s cathedral is a forest of spires you walk through; the nave is how you reach the stairs. The Empire State is an 86th-floor deck in clear air, not another marble lobby. If you only stand at the railings, you have seen the brand.
The same split shows up in quieter places. Melk Abbey from the train is a yellow cliff. The library and the river terrace are why you climbed. Notre-Dame is an island and a facade; the interior after the fire is a different building than the one people remember from 2018. Buckingham Palace is a balcony most of the year. When the State Rooms open, that is the house. Timed tickets are not a scam. They are how those rooms stay walkable. Tiqets is one desk that holds several of those slots on the same search, which is useful when you are booking the roof before you pack.
Do not stack two paid roofs on the same morning. One security line and one set of stairs is a visit. Two is a queue with a view at the end if you still have legs. Walk out a different street than you walked in.
