Arco di Riccardo is a historical landmark in Trieste. This part of the city where the arch can be found in is the oldest, dating back to the Roman times. The Arch itself is 23 feet tall and 17 feet wide and sits seemingly out of place in the slightly more updated city surroundings. Nonetheless it is a rich part of history that has been kept intact all this time. It is thought to be from the 1st century AD.