Newgrange: The Megalithic Passage Tomb at Newgrange was built about 3200 BC. The kidney shaped mound covers an area of over one acre and is surrounded by 97 kerbstones, some of which are richly decorated with megalithic art. The 19 metre long inner passage leads to a cruciform chamber with a corbelled roof. It is estimated that the construction of the Passage Tomb at Newgrange would have taken a work force of 300 at least 20 years.

http://www.knowth.com/newgrange.htm

 

Monasterboice (Mainistir Bhuithe) is an interesting monastic site near Drogheda in County Louth. The impressive ruins include a large cemetery, two churches, one of the tallest round towers in Ireland and two of the tallest and best high crosses.

http://www.sacred-destinations.com/ireland/monasterboice