I found where the Grand Temple is! At the end of AC Revolutions Jupiter was talking to Desmond. And he said that they must go to The Grand Temple and showed the USA with a dot on it. The dot was located around the same area as Boston. And one of the places AC3 takes place in is Boston. So it's simple to say that the Grand Temple is in Boston.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.