GIANT'S CAUSEWAY, Bushmills, Antrim, Northern Ireland -- Northern Ireland's most popular tourist destination: this large stretch of staircase-shaped rocks is the result of cooled lava from volcanic eruptions that took place over 65 million years ago.
Ireland: Poulnabrone dolmen, by mike nl. This dramatic site, on the karstic limestone pavement of the Burren, is one of the most famous Irish dolmens. The name Poulnabrone literally means 'The hole of the sorrows'. This site date back to about 2500 BC.
These troglodyte cave-cities were excavated as early as Hittite times, and expanded over the centuries as various marauding armies traversed Central Anatolia in search of captives and plunder. There are 36 underground cities in Cappadocia