my friends buildt a cool city but whenever I look at it my game crashes. Please help me

Every time I look at a city my friend made on my server it crashes my game.

What I expected to happen was...:
Just look at it and walk through it and stuff.

What actually happened was...:
My game crashed.

Steps to Reproduce:
1. Just look at the city from a far distance. Or even closer
2. ...
3. ...