3 Pyramids in One World? Plus More

[QuickstarReturns]

I created this world in Terraria not too long ago, large, corruption and with a few mods on (Calamity being the larger one). What I found was pretty crazy to me. Somehow, the world managed to create 3 pyramids, which I didn't even know was possible before this occurred. Not only that though, but I also got 4 of the huge living wood trees, two with the house underneath, right beside each other! This is seriously so sick. : ^)

Seed: 419308466
(probably only works with Calamity, my other mods might affect this too but I have no clue)

 

[The Storm]

I once saw a world with 5 pyramids posted here, but i hardly ever get any in my worlds.

 

[IndigoGollum]

How?! I can create 15 worlds wothout getting one.