AspiringScholar
King
Arrgghh...
I was 60 turns away from a cultural victory when Inca Rosa achieved it first.
You should always check the victory board and keep a spare army to raze a legendary city. In my current game on the Large Earth map I had Indonesia going for Cultural Victory but before they could reach it, I had the time to conquer and raze their 3rd legendary city which extended the game for 100+ turns; then Greece became the closest to Cultural Victory and I'm about to do the same with their 3rd Legendary City and possibly repeating the same with Egypt, hopefully giving me enough time for a Space Victory. If you have a strong military, preventing a Cultural Victory shouldn't be too hard. On the other hand, if you were aiming for a Cultural Victory, perhaps your army wasn't strong enough for this kind of task.
This is why I actually increased the threshold for legendary by 25%. In almost all of my games, around the late 19th century era I always had to go raze someone's legendary city (sometimes my ally) just to prevent the game from ending. What's annoying about this is that most of the time it seems like legendary status is just passively acquired and if someone is close to winning culture, it's not because they were focusing on that. Things like the city square and art eras are pretty significant modifiers which are just functions of infrastructure that a large nation would have anyway. 25% seemed like a good number to keep culture victory within reach but not something that fires off every time the game reaches the late industrial era. That feels out of balance with space and diplomatic victories, both of which are modern era options. There was a previous poster a handful of pages back who mentioned doing this too.