Ceilings are the answer to this. Cielings and exterior walls of buildings are very geometric. With lines and similar shapes that piece it together. Architecture is a good example of geometry as you will see for a few of my pictures.
A cieling in the library of Alexandria
The spiraling stairs in a pagoda in Taiwan
This is one of my favorite dome-like ceilings. Its the ceiling in the entrance of Fallsview Casino Resort in Niagara Falls.
While looking at the Niagara Falls picture, I got this one. Aren’t ferris wheels quite geometric as well?
I think they are! So here’s one of the Skywheel in Niagara Falls.