I have finally seen this beautiful convict built bridge.

The Richmond Bridge is a heritage listed arch bridge located on the B31 ("Convict Trail") in Richmond, 25 kilometres (15.5 mi) north of Hobart in Tasmania, Australia. It is the oldest stone span bridge in Australia. In 2005, the bridge was recognised as an outstanding historic place and added to the Australian National Heritage List.

The foundation stone for the Richmond Bridge was laid on 11 December 1823 and construction continued using convict labour until completion in 1825. The bridge was originally named Bigge's Bridge after Royal Commissioner, John Thomas Bigge, who recognised the need for the bridge in 1820.
Wikipedia