Now that we can use the internet to access almost anything you’d want to see and/or hear, we should make museums that archive different smells. You could find new smells you might have not experienced otherwise, or find some nostalgic smell to bring you back to a moment in your past.
What’s neat about this idea is that it doesn’t need a whole building. It could be mailed! I know this isn’t exactly what you meant, but you could start here.