You’re an anon after my own heart.
I love insane architecture. I mean, have you seen Qatar’s vagina stadium (designed by Zaha Hadid)? Alas, it’s difficult to reproduce such awesomeness, in the Sims world right now, and today we only get terrain tools. You gave me some ideas though for non-terrain tool related builds. :O

Hangzhou Sport Park

Disney Concert Hall, LA, designed by Frank Gehry

Al-Wakrah World Cup Stadium, designed by Zaha Hadid ( to be built for 2022)
I’m not building a vagina stadium.