How do you know when a city is really old?

When the "new" bridge was opened in 1793!  Puente Nuevo (new bridge) in Ronda, Spain took 34 years to build and was finished in the late 18th century.  Ronda, in the Andalusia region of southern Spain is built on the clifftops above El Tajo canyon.  The city is connected by three bridges, the newest of which is Puente Nuevo or ‘New Bridge.’  Gargantuan columns, looking as if they’ve been carved from the surrounding rock, stretch 118 metres down the chasm to the Guadalevín River.   I visited Ronda in 1999 and toured the historic bullring built in 1785, still in use today - the history there is amazing!