Moi: 12 minutes!! I thought it would take someone a little longer. Damn triangles!
OK. My second egg is a little harder.
You’ll be out of breath to get the 311 on this cackleberry; a little bird built its tall nest; at least you’ll get a certificate to say you were there.
LurkMeister’s egg is, of course, hidden at the Oldenburg Batcolumn sculpture (?) in Chicago.
My egg is hidden in the courtyard of the oldest girls’ school in the U.S.
I think I may have found a partially melted egg in the hot courtyard at The religious of the Sacred Heart in Acadiana, maybe.
(if it’s not an egg, somebody better find a shovel and a small plastic bag)
I hid my next egg at in the capital of a state that is only accessible by sea or air.
Oahu, Hawaii
Okay, my first egg is hidden in the most famous gothic house in the U.S.
Is this your egg I found at Linden Hall in Lititz Pennsylvania?
In fairness I should say it is arguably the most famous gothic house in the U.S. The people associated with it are even more well known.
My egg is at the base of the largest waterfall in California.
photopat, did I see your egg here
We have a winner! Excellent work, Moi! 
My lovely egg is hidden at the mouth of a mighty brook…
brooke sheilds has your egg.
no-one has found mine yet.
Bravo Smam.
My egg is here -
In the land of the orange bridge.
But far closer to the other one.
Perhaps a valentine had an accident.
Nope.
gotpasswords, is it near the Banker’s Heart sculpture at the Bank of America headquarters in San Fran?
Nope. I’m a bit ashamed to say that the Banker’s Heart, properly named Transcendence does seem to fit my clue, but it’s definitely not what I had in mind!
Nope to both guesses on my egg.
Hint: Look at my location. <duh-hey>
Deep Fried, I’m guessing Juneau? (I may have misspelled that. Probably.)