I've seen massive changes in Ireland in my lifetime.
The Doctor: I've seen bigger. Clara: Really? The Doctor: Are you joking? It's massive!
The great seats of power tend to be wide and open, not vertical and soaring. Red Square, Tiananmen Square, the Brandenburg Gate in Berlin - all massive but with large open spaces that project an image of might.
Of course Pluto is a planet: It's massive enough to have its shape controlled by gravity rather than material strength, which is the hallmark of planethood.
You don't have to start from scratch to have a massive impact on the world.
I am a weapon of massive consumption
My head is massive. My head is, like, off the charts.