The Notre-Dame Cathedral Basilica, a Roman Catholic minor basilica located in Ottawa, Ontario, Canada, stands as a testament to the city's rich religious heritage. Designated as a National Historic Site of Canada in 1990, this architectural marvel is the oldest and largest church in Ottawa and serves as the seat of the city's Roman Catholic archbishop. Its distinctive twin spires and gilded Madonna are landmarks in the Lower Town neighborhood, easily recognizable from Parliament Hill and beyond. The basilica's history dates back to the mid-19th century, and it continues to be a place of worship and a beacon of cultural significance.