Ad Deir (the monastery) is one of the most famous buildings of the ancient city of Petra. It's the biggest monument, the facade is 45m large and 42m high.
Khazneh (al-Firaun) - treasure of the Pharao - is one of the best known buildings of Petra. Carved in the Sandstone it is 40m high and 28m large, it's architecture is of hellenistic influence