access a computer in a LAN

If i have hosted my login and other web pages in a computer connected in a LAN network, how can the pages and other data stored in my computer be made accessible to any other network outside the LAN.

 

first thing I'd think of is pay for a service like Dropbox, like 10GB a month, and just set it to update particular folders, and when you update the web pages store them in your dropbox folder too..... probably a much better way than that though