Macquarie Culvert - Credit: Wikimedia Commons
The Macquarie Culvert is a double brick culvert under the original Mrs Macquarie's Road (also known as Lady Macquarie's Road) in the Royal Botanic Gardens in Sydney, Australia. The culvert was probably built at the same time as the original road, between 1813 and 1816, making it almost certainly the oldest bridge in Australia. Read more on Wikipedia
Source: en.wikipedia.org