The Civic Centre, now TD Place Arena, at Lansdowne Park. Completed in 1967 to replace the aging Auditorium in Centretown, it's unique design integrates the north side stands of Ottawa's CFL stadium.
The Ottawa 67's played their home opener on December 29, 1967 (playing their first games at Hull's Robert Guertin). Had it opened in January, the Civic Centre would not have been eligible for Federal Centennial Funding.
The arena was not fully complete, so seats had to be taken from the nearby Coliseum Building. 500 fans had to be turned away because they weren't able to find enough seats.
In April 1968, it hosted the Liberal Convention where Pierre Elliott Trudeau was voted Party Leader, and by extension, Prime Minister of Canada.
In 1992, the modern Ottawa Senators called the arena home, up until the then Palladium opened in January 1996.
The future of the arena is uncertain. The City of Ottawa and OSEG (Lansdowne partners, owners of the 67's and Red Blacks) are discussing the possibility of demolishing the arena to make way for new north side stands for the CFL stadium, housing and we assume a new, possibly smaller, arena.
https://en.wikipedia.org/wiki/TD_Place_Arena