How big is the Universe? Well, what do you want to compare it to? After all, it's all relative. It's interesting to note that between the Planck length and the size of the known universe, humans (magnitude 100) are at about 65%, which means we're pretty huge.
A website developed by Cary Huang called Scale of the Universe allows for an interactive experience, whereupon the user can scroll in and out, all the way from Quantum Foam to the very edges of the observable universe.
I love the diversity of objects included, and the animations and text descriptions round out the experience nicely. It's an awe inspiring depiction of humans and our impact, but also of the limitations of what we know and can experience.