Tim Urban posted some interesting articles on Wait but why that illustrate large numbers:

From 1 to 1 000 000 is the tame beginning, with visualizations of numbers up to a million.

From 1 000 000 to Graham’s Number continues the journey up to Graham’s Number, compared to which a Googol and even a Googolplex is just an epsilon.

In 7.3 Billion People, One Building, he explains how long a chain of all living humans would be, and how big a building would have to be to fit them all in.

These were posted in November 2014 and March 2015, but except for the number of humans on earth (which has been estimated at 7.4 billion in March of 2016) should still be current.