Most of that stuff is from an old server I was admin on, I pulled one item that each admin had built, kind of a nostalgic thing for me - Especially that Cathedral, quite possibly the coolest thing I have ever personally seen built in Minecraft. My daughter also got me to add some Dora and Deigo pixel art since she is obsessed. I didn't design the pixel art though, I just ran a web image through a program that gave me a block by block conversion.
The unfinished Golden Gate replica on the left is my most recent project. Math on the parabolic wires is a bit tricky and I am being lazy about figuring it out.