Home to Baltimore's premiere events and house parties. They're a bit infrequent, so check the website.
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Baltimore Ravens
Baltimore's new football team, in the form of the former Cleveland Browns, is wildly popular with locals, especially following their Superbowl wins in 2000 and 2013. As for the stadium itself, known unimpressively as "M&T Bank Stadium," but better referred to "The Bank", "The Nest", "The Asylum," or just "Ravens Stadium," is new as of 1998 and quite nice. For food, be sure to pick up some boardwalk fries. For parking, just don't. It's $40 and game day traffic is emphatically not fun.
Baltimore Orioles
The local baseball team plays at Oriole Park, better known as Camden Yards. It's often considered one of the nicest in the nation, with a retro style, but modern facilities (constructed in 1992). No name is better associated with the stadium than Cal Ripken Jr., who set the world record for playing 2,131 consecutive games on 6 September 1995, (a little less well known, but still historic, was Eddie Murray's 500th home run, exactly one year later to the date). Avoid trying to park here, for the same reasons as below for Ravens Stadium. Even when a game is not being played, the team still offers tours of the ballpark starting in March (though check their website for times).
This museum is actually in the house where the Great Bambino himself was born. The museum isn't huge, but should be considered a can't-miss attraction for baseball fans. There is a white baseball "trail" leading from Camden Yards straight here, so it isn't hard to find. Plan to spend about a half hour looking at the exhibits on his life, and also the neat new one on the 500-homer club.
This big hilly park is one of Baltimore's best points for picture taking, as it overlooks the Inner Harbor, with great views of both the north and south skylines. You'll note that the cannons all seem to be awkwardly pointed at the city's central business district. The cause for this was the Union troops's suspicion of the famously irascible and rebellious Baltimoreans from siding with the Confederates in the Civil War (or simply from generally rioting). They set up on this well located hill to intimidate the city into submission.
Baltimore's museum of the common man defies the idea that history is just about politicians, wars, and artists. You'll see recreations of a cannery, a turn of the century textile factory, a printing press, Dr Bunting's old pharmacy, and exhibits on the Domino Sugar Factory. There are plenty of good hands-on activities for kids—they can even become child laborers in the textile shop!