Hundreds of important archaeological discoveries have been made at excavations across Northern Ireland during the past four years.
The Department for Communities licensed 800 digs, mainly as a requirement of the planning process where developers are required to record important sites.
It has now made details of significant finds available to the public in a booklet entitled Unearthed.
The sites range from Stone Age farms to 19th Century urban industry.
Senior archaeologist Andrew Gault explained why the department wanted to publish the guide.
"It's the process of the archaeology that's going on all the time in Northern Ireland in the background that people maybe aren't aware of," he said.
Unearthed concentrates on the years from 2015 to 2018, as this was the period when planning powers were transferred to local councils, but authors hope to make it a regular publication.
Mr Gault described the work resulting from the planning process as "mitigation archaeology".
"The works here are unexpected and unknown archaeology that emerges when the topsoil is removed," he said.
Discoveries are commonly from:
- The period after the Bronze Age settlement of 2500 to 800BC
- Between the time of St Patrick (about AD500 ) to the arrival of the Normans in the 12th Century
"There's potential to find a whole range of archaeological sites through the whole range of human occupation - back to 10,000 years ago when people first arrived here," said Mr Gault.
Sites discovered include:
Glenshane ritual site
This late Neolithic ritual site was discovered during a quarry extension in Glenshane.
Archaeologists dated it to about 2500BC. The find comprised a timber circle - large wooden posts with an outer fenced forecourt - which was likely to have been the site of elaborate rituals attended by large crowds of people.
Tanning pits in Belfast city centre
Fifteen wooden pits were uncovered at the Royal Exchange development site in the very heart of the city.
They date from the 18th century and form part of the city's early industrial heritage.
They were used for soaking animal hides in the manufacture of leather on a commercial scale - an unpleasant and smelly job.
Neolithic house at Dungiven
This substantial house was uncovered at Turmeel townland in County Londonderry during upgrading work on the A6 road.
Experts said it dates from the time when farming was first introduced to Ireland almost 6,000 years ago.
The building measured about 14 metres by seven metres. Almost 1,400 pieces of Neolithic pottery were also uncovered.
Bronze Age roundhouse at Rasharkin
A Bronze Age roundhouse was identified at a solar farm in Rasharkin, County Antrim.
Enclosed houses like this generally date to the Middle Bronze Age, about 1500BC.
Finds included a possible rubbing stone and several pieces of late Bronze Age pottery.
Cooking Pit at Donaghcloney
The site was uncovered at Laurel Hill solar farm in County Down. It is a "fulacht fiadh" - a cooking pit for wild animals.
Heated stones were placed in a water-filled trench: Meat could be cooked in the boiling water.
Solar farms have become a useful source of sites for archaeologists as they are often developed on south-facing slopes in open countryside.