I've seen the Mets on the road in Philadelphia (Veterans Stadium and Citizens Bank Park), Pittsburgh (PNC), Baltimore (Camden Yards), Atlanta (Fulton County), Seattle (Safeco), Washington (Nationals Park), and San Juan (Hiram Bithorn, vs. the Marlins). None of the games really stand out except for the most recent one, October 1, 2016 in Philadelphia, the game where the Mets clinched the Wild Card.