The Siq, which is the ancient main entrance leading to the city of Petra, starts at the Dam and ends at the opposite side of the vault, a split rock carved out of the rock by natural forces and by the Nabataeans. The Siq, the main road that leads to the city, starts from the Dam and ends at the Treasury. It is a rock canal that measures 160 meters in length, 3 to 12 meters in width and reaches up to 80 meters in height. The main part of the Siq is created by natural rock formation and the rest is carved by the Nabataeans.

It is evident that the water flowed through pottery pipes but the channel is carved from the rock and covered with stone, and there are spaces to filter water. At the start of the Siq the original Nabataean dams are visible, and these prevented the flooding in the Siq, and collected water for use. The floor of the Siq is paved with stone slabs.

The Treasury is one of the most beautiful buildings in Petra. It was named the Treasury because the Bedouins used to believe the urn sculpted at the top contained great treasures. However, in reality the urn represented a memorial for royalty. The Treasury consists of two floors with a width of 25.30 meters and a height of 39.1 meters.

The purpose of the Treasury is unclear: some archaeologists believed it to be a temple, while others thought it was a place to store documents. However, the most recent excavation here has unearthed a graveyard beneath the Treasury.The Treasury comprises three chambers, a middle chamber with one on either side, the elaborately carved facade represents the nabataean engineering genius.

As you enter heart of the city, the Nabataean theater is located on the left. It was built in the first century AD in the form an arc that is 95 meters in radius and 2.23 meters in height. It is carved in the rock with the exception of the front part, which was already sculpted by the Nabataens. The Theater consists of 45 rows of seats that can accommodate 7-10 thousand spectators.

The theater contain 45 rows that may seat 6000-8500 people. It is divided into 3 sectors( maeniana). It is almost all carved in the rock. In the 2nd century A.D., the theater was enlarged by the Romans, who apparently cared little for Nabatean traditions, and cut into nearby Nabatean tombs to create a vast 7,000-seat venue.

After passing the Theater, on the other side, there is a set of interfaces, the first one of these interfaces is the Urn Tomb. It measures 16.49 meters and 26 meters in height and comprises two floors supported by arcs.

The graves were located at the back end of the tomb but later, as evidence in the Greek inscriptions in the Urn Tomb, in 447 AD were converted into a church with new side doors were added.

Palace Tomb: The building is imposing than the others and is imitating the great Hellenistic palaces. The 4 doorways represent a 4 simple burial chambers. The Palace Tomb is very wide, and has three distinct stories in it's facade. It is almost as if the Palace Tomb was designed as a backdrop for State funerals. Thought to be Rabbel II tomb the last Nabatean King.