The thing I liked about this one was the way the results were combined concisely without duplication. Then, I began clicking on the specific categories in the sidebar. Much to my surprise, each specific category had it's own specific engines to search. The web museum of Paris can be a good way to spend a few hours. Thousands of famous paintings can be viewed online, with descriptions of the artists that painted them.
Art is grouped by theme, as well as period for easy browsing.
Gangsters.org is the place. Listed in alphabetical order by letter, hundreds if not thousands of websites are listed and linked containing just the classic game you are looking for. All games listed are 'abandonware', or games that are no longer sold in the stores and hard to find. Have fun finding games from the old days of Atari, Coleco, Odyssey, and the arcade at the mall. They are eventually collecting 6 billion drawings to represent the population of the world, and printing each and every one in a volume of over 12,000 books.