Knowth

Listen for a moment. Wind moves across the grass on top of a great green mound, and somewhere below in the valley a crow calls over the fields. Underfoot the ground is soft and damp, the way Irish ground usually is. Around you, low grassy humps rise from the land like sleeping animals. You are standing among some of the oldest monuments in Europe, older than Stonehenge in its stone form, and older than the pyramids at Giza.

This is Knowth, in the valley of the River Boyne, a short drive west of Drogheda. It is one of three great passage tombs in a landscape called Brú na Bóinne, which means the palace or mansion of the Boyne. Its two famous neighbours are Newgrange and Dowth. Together they form a UNESCO World Heritage Site. A passage tomb is a large mound of earth and stone with a long stone corridor leading to a chamber deep inside.

The people who built Knowth were Neolithic farmers. Neolithic means the New Stone Age, the period when people in Ireland first began to farm, keep cattle, and settle in one place. They built this mound more than five thousand years ago, without metal tools and without the wheel. They moved huge stones, some from many kilometres away, using muscle, rope, timber, and patience. Think about that as you look at the size of the main mound in front of you.

The great mound does not stand alone. Around it sit smaller satellite tombs, clustered close like a family around an elder. Some archaeologists think certain small tombs may be older than the large one. This is a cemetery, but it is also a statement. Whoever built it wanted to be seen, and wanted their dead to be remembered across the whole valley.

Now walk slowly along the base of the main mound. You will see a ring of large flat stones laid end to end. These are the kerbstones. They hold the edge of the mound in place, like the rim of a giant bowl. Many of them are carved. And here is the first surprise for most visitors... Knowth holds a very large share of all the known megalithic art in Western Europe. Megalithic simply means made with large stones.

Look closely at the carvings. You will find spirals, circles inside circles, zigzags, wavy lines, and lozenges, which are diamond shapes. Nobody knows for certain what they meant. Some people see the sun and moon. Others see maps, calendars, or patterns from altered states of mind. One kerbstone carries a fan of lines that some visitors compare to a sundial. These are all ideas, not proven answers. The carvers left no written words.

The second surprise is hidden inside. The great mound does not have one passage. It has two. One opens to the east and one opens to the west, running back towards the centre from opposite sides. Some researchers link these directions to sunrise and sunset around the spring and autumn equinoxes, when day and night are about equal in length. That idea is popular, but it is debated. What is certain is the skill it took to build two long stone corridors inside one mound.

The passages were rediscovered in the 1960s, during a long excavation led by the archaeologist George Eogan. His work at Knowth lasted for decades. The eastern passage ends in a cross-shaped chamber with a high stone roof. Inside it, excavators found a carved stone basin, decorated with great care. Visitors cannot walk the passages today, because the structure is fragile. But a room cut into the mound lets you look towards the old stonework.

Knowth did not fall silent when the Stone Age ended. People returned again and again. In the early Christian period, the mound became a home and a fortress. People dug souterrains here, which are underground tunnels used for storage and for hiding in times of danger. Later still, Knowth was a royal seat for kings who ruled part of the region called Brega. Their old Irish name for the place, Cnogba, still shapes the modern name you hear today.

The story keeps going. After the Normans arrived in Ireland in the twelfth century, they used the mound as a defensive site. Later, Cistercian monks from nearby Mellifont Abbey farmed the land here. So one hill holds the dead of the Stone Age, the tunnels of early medieval families, the halls of kings, and the fields of monks. Few places in Ireland show so many layers in one spot.

Take a moment to climb to the top, if the path is open. From the summit you can see across the Boyne Valley. Look for the river curving through the fields, and for the low shapes of other mounds in the distance. On a clear day the green runs in every shade, from deep hedgerow green to pale wet grass. Clouds move fast here. Light changes on the stones from minute to minute.

It helps to imagine the valley as the builders knew it. There would have been smoke from cooking fires, cattle on the slopes, and the sound of stone striking stone as carvers worked. The white quartz and dark stones would have caught the light. This was not a quiet place on the edge of the world. For these farmers, Knowth was a centre, a place of gathering, memory, and ceremony.

Before you leave, stand again beside one of the carved kerbstones. Put your hand near the surface, without touching it, and follow a spiral with your eye. Someone made that line with a stone tool, more than five thousand years ago. The wind on your face is the same wind they felt. As you walk back towards the bus, look over your shoulder once more. The mound sits low and green in the field, keeping its secrets, as it has for a very long time.