Jerash is a large and fascinating archaeological site. One of the most important objectives is Cardo Maximus (in the postcard), stretching north from the Oval Plaza, which is surrounded by a colonnade of 1st-century Ionic columns. The cardo was a north-south-oriented street in Roman cities, military camps, and coloniae, an integral component of city planning. The main cardo was called cardo maximus, which in general served as the primary road. Most Roman cities also had a Decumanus Maximus, an east-west street that served as a secondary main street. In other words, the cardo was the "hinge" or axis of the city, derived from the same root as cardinal. Cardo Maximus in Jerash is still paved with its original stones and bears the ruts of chariot wheels. As part of a remodeling of the street around 170 AD, the original Ionic columns were replaced with a more decorative Corinthian colonnade. The Cardo was lined with a broad sidewalk and shops and an underground sewage system ran the full length of the street, into which rainwater was channeled through holes on the sides of the street.
About the stamps
Both stamps are part of a large series of definitive stamps, Triumphal Architecture, Jerash, about which I wrote here.
Jerash - Wikipedia
Jerash Jordan - Sacred Destinations
Sender: Marius Vasilescu
Sent from Aqaba (Aqaba Governorate / Jordan), on 19.03.2014