Just a thought I had while attempting to find accurate and believable images of the future.
There could be images (either taken from the internet, or custom created) of the future put in the sidebar of the timeline for each decade or century depicting what the individual predictions are conveying.
For example, for the 2020s section, there could be images of people in spacecraft investigating asteroids, images of the future London Underground Tube train, images of human-like AI on computers of the future.
And on the pages for each century, have an image of what cities might look like. I've searched everywhere for these types of images, like images from what a 2100 city might look like. For example:
2000s - Todays buildings, with a few more glass buildings and vertical farms, and a few flying cars travelling above normal roads with solar panels on top of street lights, with a spacecraft in the distance blasting off to the Moon in the recently revived lunar program.
2100s - A lot more futuristic-looking buildings, with more greenery and artificial trees, with holographic displays in city centres, etc like this example -http://sharewhale.co...6-04-151055.png
You get the idea. You don't have to implement this, obviously it's going to take a long time to find the right images, or create the images that depict the future somewhat accurately. Just something to think about.