Whoa... exploring with settler for 3 turns.
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Search for "Spanish Gamble" on reddit. They use settlers for exploring for 15 turns. And wins.
As for bad things I did...
In my current game as Spain, I started on the east end of a continent. I was exploring for natural wonders and have found the Great Barrier Reef, but it was on the west side, with Poland in between. Nonetheless I've still settled there, and Casimir was not happy and asked me to stop settling close to him. I greedily refused.
Very soon after I've found we're the only ones on the continent. The continent was big enough for each of us to build 5 to 6 cities and co-rule together. But hey...why not rule the whole continent all by myself? Besides, Barcelona is not feeling safe so deep behind another civ's lines. So I started to spam chariot archers and teched for catapults. DOW time.
I destroyed Poland with ancient blitzkrieg, and with ancient tanks i.e. chariot archers. This is my first time actually using them and they're AMAZING. Poor Poland never had the chance to resist. I wiped them off the Earth in like 2000 BC. However, the animation of he declaring lost to me made me realize how bad a man I was.
Anyway I feel so happy ruling a whole continent and have a world dominating religion. Time is not always peaceful though. I've DOW'ed on Attila twice, once for spotting a great prophet of his somewhere in the ocean and a bunch of missionaries on another side of the ocean, so I decided to destroy them all to prevent their religion from spreading. Another time for seeing him settling on MY continent. I DOW'ed on Siam too because I saw he sent a settler onto MY continent. In order to distract him I bribed first Attila later Mongolian to attack Siam. I think I may one day attack him personally because he's the hardest cultural nut to crack in my CV strategy. No one touches MY continent, MY religion, or MY victory.