Dream of building

Last night I dreamt I was witness to my family's history in America from pre-revolutionary times until the present. I saw my ancestors interacting with Native Americans and teaching them how to understand English. I saw buildings sprout from the earth that had been underwater only seconds before. As the time periods changed, buildings disappeared and new ones appeared in their places while the people around me appeared in clothes appropriate to the period. Just before I awoke, another group of buildings was emerging just as everything was being covered with earth. I escaped by riding on the cupola of the tallest building. It wasn't until then I realized I was bring observed by a group of people who existed outside what was going on, just as I had been observing the action in my dream.