I had an enjoyable visit to Gulliver's Gate ( www,gulliversgate.com) in Manhattan yesterday and, even though it is HO scale, and didn't run enough trains to suit me, it was fantastic.
A bit pricy ($27 for us old folks, $18 for vets) but it is 50,000 square feet has 967 buildings and 102 bridges. It represents 25 cities from 5 continents, only NYC was not yet finished.
My favs were:
The Panama Canal. Real water and prototypical operation with huge cargo ships going through it and moving on - ya gotta see it.
The airport (bigger than my whole basement) with planes taking off and landing every 4 1/2 minutes.
A visit takes about 2 hours, if you are in town I'd recommend it