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Geoff,
The Messier globulars and the vast majority of NGC globulars are contained within our own galaxy and are known as intergallactic globulars. Globulars in other galaxies are known as Extra Galactic Globulars. There are lots of those. The ACS Virgo Cluster Survey categorised 20,000 globular clusters contained within 100 galaxies in the Virgo galaxy group. There are lots that can be seen in larger amateur scopes including those in M31 and M87. Of course there are a multitude of extra galactic globulars to be observed in the LMC and the SMC and a lot of these are visible in smaller amateur scopes.
CS-John B
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