The excavations revealed capitals, reliefs and parts of a column, and reliefs in the temples courtyards that were created in about 1250 B.C.
It was discovered when a repair was being done on the mosque where fire damaged some parts of the mosque in June.
Also during the discovery the reliefs had animals and humans in which are not accepted by religious people to be inside mosques, experts said.
According to the article published in this week's National Geographic, "Among the most important scenes are those that feature Ramses II offering the sun god Amun Re two obelisks to be installed at the temple's front facade. One of those obelisks still stands at the temple, and the other is now at the Place de la Concorde in Paris.
Experts say the carved inscriptions provide some of best examples of cryptographic or enigmatic writing, an unusual form of hieroglyphic text in which each glyph could stand for an entire word, phrase, or concept.