The MSPCA's Angell Animal Medical Center turned 100 years old earlier this year
It's one of the oldest veterianry hospitals in the US. Half of today's Boston Globe Magazine features Angell: http://www.bostonglobe.com/magazine Scroll down the page to find the feature and slideshow. The Boston Globe has a limit of 5 free articles that one can read at one time so you may need two days to read through the entire feature (6 articles and 2 slideshows).