The weapons cache was most likely hidden by Jewish rebels some 1,900 years ago after being seized from Roman forces.
The fragments shed light of Hadrian's trips to Africa and more.
The Antiquities Authority said it had warned local authorities the arch was in danger of collapsing.
The vessel was probably part of a river fleet serving Viminacium, the sprawling and highly-developed Roman city of 45,000 people.
A rare half-shekel coin dug up in the Ein Gedi nature reserve was inscribed with the words “The Holy Jerusalem” in Hebrew.
A new scholarly article examines the historical evidence of Jewish participation in the gladiatorial arena.
Large ships constructed by Roman Emperor Caligula were extracted from the lake in the 1930s but were destroyed during World War II.
Police found the artworks in a storage room in Baena - a town near Cordoba - and said a married couple had been arrested on suspicion of trying to sell art treasures on the black market.
Surrounding the mausoleum, archaeologists discovered 80 Roman burials, copper bracelets from the period, glass beads, a bone comb, more coins, and some pottery.