Overseas stadia that I have seen sporting events at; (plus san-siro)
Bernebau - poor man's Wembley. Nothing special.
San-Siro - load of concrete chucked together- wasn't enamoured (although visited on non match day)
Met life stadium - New York. Impressive - Wembley- esqe. World Cup final being held there.
Heinz Field- Pittsburgh. Lovely new (ish) stadium, full of character and purpose built for NFL - two massive ketchup bottles that make up scoreboard!
PNC Park - Pittsburgh. (Baseball) My favourite!!
Again, new (ish) , built at same time as Heinz Field after old multi-use bowl stadium was demolished.
Open end overlooking rivers and Pittsburgh Skyline.
Beautiful stadium!!
Citi-Field - New York. Another new purpose built baseball stadium. Amazing!!
Yankee Stadium - New one. Personally didn't think as good as Citi-Field, but still well-done, modern and keeping in touch with tradition.
Been lucky being able to visit those stadiums in the US, all fairly new and designed with character whilst keeping tradition in mind.
Did Old Yankee Stadium while the new one was being built. It was a dump and I didn't like it. Entire place seemed revolved around getting your money from your pocket rather than providing an enjoyable experience (but i guess over there for a number of people spending money IS enjoying yourself.
Wrigley Field, Chicago I loved. Really old school but had a warmth and friendliness to it.
Quite liked the Rogers Centre, Toronto - quite friendly and the roof is an amazing bit of engineering. Stadium itself is a bit concretey though.
Old Meadowlands was pretty good but it's in the middle of nowhere and the size of the parking area around it made it a bit monolitic.
Soldier Field sadly didn't take in a game but loved the design and it being near the lake.
Madison Square Garden isn't really a stadium but had a nice feel inside it.
Toyota Park and BMO Field had a more old-fashioned/lower division football stadium feel but with the American take on it, so not as good.
Stade Bollaert-Delelis, Lens is an old stadium and feels more like a HR type ground, but with one corner bizarrely cut off because of the road. Still got no idea how we found it or our way back.
Lately, I been finding myself enjoying the cricket stadiums. Dunno if it's just me getting older or just the slower pace and length of the game means you feel more part of it.