Tombs Some simple tombs along the "Street of Necropolis".
interesting rocks Petra is not only interesting for archeological interested people, but also for geological interested ones. 
decorated tombs Many rich decorated tombs, but from the inside they are all bare walls.
many tombs All rock are coverd in tombs. Next to each other and often on top of each other too.
roman ruins Further down along the Wadi there are some roman ruins. Most of the tombs are Nabataean, which means that they are much older then the roman ruins.
long way up Climbing endless, well worn steps to the "Monastery". Good hiking shoes are highly recommendable.
Monastery The size and beauty of the "Monastery" pay of for the long hike.