All the cool things!
BBC History and People
This was a cool site that is a good resource for learning about famous people. It is a solid place to start and get some information. Link right here to the section on Christopher Columbus.
Here is a dandy site to use to make some very simple but easy to read time lines to organize dates and eras. The stacked way you can build it makes for a good visualization of multiple events overlapping. Overall pretty legit. Link right here.