Two for me as well, both in the US, although most of my flying has been here in the UK...
The first was flying down the Florida Keys in a rented (new) 172 in perfect March early evening weather last year, clear skies, no wind, blue sky, blue sea, brilliant.
The second was in New York flying the VFR corridor from the George Washington Bridge, down the Hudson river past Manhattan at 1000', over the bay past the Statue of Liberty, across the Verrazano bridge (between the towers) and down the coast of Long Island about 2-3 miles south of JFK. The best moment came when NY Approach called me and said 'contact Kennedy tower', and I had to get my call in from my lowly PA28, between the departing 777s and 747s. Magic.