On This Day in History - October 20 |
| Discover today's historical events and the facts. Listed here the time line of events that happened on this day in history |
| Click on the date from the below calendar to know the historical events happened on that particular day. |
| What Happened On This Day In History - October 20 |
1818 October 20
1818-10-20
49th parallel forms as border between US and Canada
1973 October 20
1973-10-20
The Sydney Opera House opened. It is one of the most famous 20th century buildings as well as one of the most famous performing arts halls in the world.
