Aran Island of Innis Oirr (Inisheer), Ireland - these walls were built over the centuries to clear fields for farming. One of my favorite places in Ireland. The cliffs are beautiful! If it's nice you can ride bikes around the island.
The Hexagons - Giant's Causeway, interlocking basalt columns, the result of an ancient volcanic eruption. Located in Northern Ireland, it was declared a World Heritage Site by UNESCO in Photo by Thomas Mader.