450 metres above the wild Irish Sea, on the exposed peak of Yr Eifl, clinging to the northwestern edge of the Llŷn Peninsula stands the vast, ancient ruin of Tre'r Ceiri ("Town of Giants") - one of the best-preserved hillforts in the world.

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Surrounded by a massive 3.5m (11ft) tall stone wall, Tre'r Ceiri's round houses, gateways and ramparts are in remarkable condition.

The mountain was a highly strategic vantage point for a succession of peoples, from the Bronze Age through to Roman occupation.

Tre'r Ceiri sits on a steeply-sloping site, its summit occupied by a large early Bronze Age burial cairn - quite clearly preserved, and well-respected by those who later built the wider hillfort.

Small oval, terraced enclosures surround the fort, and were likely used as livestock enclosures and vegetable plots.

A spring immediately outside the fort provided a water supply for people and animals.

The Iron Age fort may have housed some 100 people living in 20 houses, whereas during Roman occupation (50-400AD), the fort became a small town, with as many as 400 inhabitants.

Discoveries include pottery, iron tools, glass beads and highly decorated jewellery.

Find out more about one of Wales' finest prehistoric citadels

https://museum.wales/iron_age_teachers/hillforts/tre_ceiri/
https://www.megalithic.co.uk/article.php?sid=5941
https://coflein.gov.uk/en/site/95292/details/trer-ceiri-hillfort-llanaelhaearn
https://www.visitsnowdonia.info/history 
http://www.heneb.co.uk/cadwprojs/cadwreview2012-13/trerceiripublications12-13.html

This thread is just one of a growing collection of threads about the secret wonders of Wales.

Find them all here https://twitter.com/i/events/1271423644108034050

Look! Lynne went to visit Tre’r Ceiri!

(scroll back up to read the amazing story of this treasure of humanity - an ancient hillfort high above the wild Irish Sea) https://twitter.com/Teeny_peeps/status/1298700392432271361