Originally Posted by mithrandir 
You should take a picture of fireworks from the same location every year until 2048 and then run it as a film clip similar to that year in 30 seconds on yahoo (LOL).
While I probably won't be going that route, Federal Hill has been a very popular place with Baltimoreans since before the United States was even an independent country (and it's where Baltimore had a big celebration when the US Constitution was ratified, in addition to figuring in the War of 1812 and the Civil War), so there are tons of pictures of Baltimore taken from Federal Hill, dating back to the early days of photography. (I'm more or less arbitrarily deciding that if it pre-dates Mathew Brady's Civil War photographs, it qualifies as "the early days of photography.")
While one couldn't quite turn the pictures into a film clip, it's not difficult at all to come up with a series of photos taken from Federal Hill park, showing changes in the harbor and the downtown over the course of the past 150 years.
Here's one of the earlier ones, from 1849. The Washington Monument (the one in Baltimore pre-dates the one in DC) is clearly visible in the distance, which indicates that the camera was pointed in pretty much the same direction as mine was, when I photographed the fireworks. (Can't see the Monument in my photo, due to tall buildings and the fireworks. But trust me, if the buildings and fireworks were invisible, you'd be able to see it.)
Lots of others may be found at
Google Image Result for http://www.mdhs.org/Library/Images/Mellon%20Images/Z24access/z24-00012.jpg
Today, it's such a popular spot from which to photograph the Baltimore skyline, that's it's almost a cliché. Which has never stopped me, you understand.
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Michael