The oldest existing indoor <a href="https://en.wikipedia.org/wiki/Ice_hockey" id="mwnQ" rel="mw:WikiLink" title="Ice hockey">ice hockey</a> arena still used for the sport in the 21st century, <a href="https://en.wikipedia.org/wiki/Matthews_Arena" id="mwng" rel="mw:WikiLink" title="Matthews Arena">Boston Arena</a>, opens for the first time.