This includes evidence that tribes once existed whose people had exceedingly tall stature. These are the Anakim, Avvim, Rephaim, Emim, and Zamzummim.
Skeletal remains have been unearthed in Gezer as well as at Tel Es-Sa'ideyeh, Jordan. These are of people who were between 7 and 10 feet tall.
The Egyptian Execration Texts (composed between 1900 - 1700 BC) are a collection of Egyptian records (or pronouncements against foreign powers). Interestingly enough, they refer to the "ly-aneq" people, or what the Bible calls the Anakim (see Numbers 13: 33 and Joshua 11: 22). These records substantiate the Biblical account that these people were giants. Ashdod is even called the "city of Giants" in these documents, which can be seen on display in the Berlin Museum. By the way, Ashdod is one of the cities of the Philistines (I Samuel 5: 1). Goliath is a Philistine (I Samuel 17: 4).
The Papyrus Anastasi I (written around 1300 BC) is a political commentary written by Egyptian scribes. It mentions the existence of 9 foot tall warriors. These are referred to as the "Shasu" and were said to live near Mount Carmel.
Bet Guvrin (see above) is also called "Beit Jibrim" of the "House of Gibborim" - in effect, all of these translate to the "House of the Giants". It seems that this area of enormous caverns was once home to giants.
Pliny, a 1st Century historian, testifies that a 9 foot 9 inch high giant named Gabbaras commanded one of the Roman legions (Legion Adiutrix).
Artifacts dug up by British archeologist, Sir Flinders Petrie, suggest people of enormous stature. He was digging at Beth-Paleth - some 18 miles south of Gaza (and the area inhabited by the Philistines). Mind you, not all Philistines were giants. The vast majority were not - however, some clearly were.
In 1928, the Ras Shamra Texts were found on the site of the ancient city of Ugarit (located in Syria). The cuneiform style of writing used makes these tablets contemporaries of Joshua - i.e., 1400 BC. These speak of the existence of "Rephaim" - said to be a race of giants.
Each of these is yet more extra-biblical evidence that the Bible is reliable. The story of Goliath is not some child's fairytale. It is history, as indeed is all of Holy Writ!