Ireland is full of wonders no matter where ... They are thought to be man-made Megalithic "passage tombs," thought of as underground grave sites resembling large mounds practically growing out ...

The remains of 1,000 massive stone burial sites, mainly from the Neolithic period, are scattered across Ireland ... transported and manufactured the megaliths is still a mystery that connects ...

There are 35,000 examples of megaliths in Europe, with the earliest, in Western France, dating back to 4700 BC. Meanwhile, examples in western Britain and Ireland go back to around 3900 BC.