Not a bunker per say but I recently learned that in some states/cities you don’t pay property taxes on square footage below ground so you end up with people building more space below than above ground and Virtual Sun can make it feel like above ground space. Just visited a billionaire project last week where this was the case.
Kinda hilarious that the people with the money to pay those property taxes would go to such lengths to avoid them.
Still, I'll keep this in mind on the off chance it ever becomes relevant to me.