CERN invented the World Wide Web, and the physicist responsible invented HTML as well!

We all use the Internet, and most of us take the World Wide Web for granted. Without it, the Internet wouldn't be very user friendly. Like the Internet, the Web wasn't initially intended to be for the every day user, though the potential was seen from the start.

CERN, the European Organization for Nuclear Research and home of the Large Hadron Collider, wanted to address the demand for automatic information sharing between scientists at universities and institutes around the world. British scientist Tim Berners-Lee came up with the World Wide Web as the answer. He specified the use of HTML and wrote the browser and server software in late 1990, though it was not officially taken on by CERN initially.

The first website was put up by CERN in 1990. The website described the basic features of the web; how to access other people's documents and how to set up your own server. In 1993, CERN released the World Wide Web software in the public domain for anyone to use. The next release was made available with an open license as a way to maximize its dissemination.

(Source)