Bonus Level: Blogathon Game #11

For anyone following, over at the Blogathon site, there is an on-going google puzzle.
This puzzle:
n Florida, at night, unseen
He built it for his “sweet sixteen”
He levered tons of coral stone
And there he lived and died alone

The answer:
Coral Castle in Homestead Florida, built by Ed Leedskalnin to impress 16 year old Agness Scuffs.
You can read all about it here.