"Škocjan Caves is a system of limestone caves in the Kras region in southwestern Slovenia, containing collapsed dolines, about five kilometres of underground passages, caves more than 200 metres deep and many waterfalls. This is one of the best-known sites in the world for the study of karstic (limestone) phenomena.
Škocjan Caves have been on the UNESCO list of World Heritage Sites since 1986." - in: wikipedia
"The Prehistoric Rock-Art Site in the Côa valley is one of the largest known open air sites of Paleolithic art.
In the late 1980s, the engravings were discovered in Vila Nova de Foz Côa, in northeastern Portugal. The site in situated in the valley of the Côa river, and comprises thousands of engraved drawings of horses, bovines and other animal, human and abstract figures, dated from 22,000 to 10,000 years." - in: wikipedia
It was inscribed on the World Heritage list in 1998.
Monastery and Site of the Escurial, "built at the end of the 16th century on a plan in the form of a grill, the instrument of the martyrdom of St Lawrence, the Escurial Monastery stands in an exceptionally beautiful site in Castile. Its austere architecture, a break with previous styles, had a considerable influence on Spanish architecture for more than half a century. It was the retreat of a mystic king and became, in the last years of Philip II's reign, the centre of the greatest political power of the time." - in: http://whc.unesco.org/en/list/318
"The Ilulissat Icefjord runs west 40 kilometres from the Greenland Ice Sheet to Disko Bay close to Ilulissat town. The glacier flows at a rate of 20-35 metres per day, resulting in around 20 billion tonnes of icebergs calved off and passing out of the fjord every year. Icebergs breaking from the glacier are often so large (up to a kilometer in height) that they are too tall to float down the fjord and lie stuck on the bottom of its shallower areas, sometimes for years, until they are broken up by the force of the glacier and icebergs further up the fjord. On breaking up the icebergs emerge into the open sea and initially travel north with ocean currents before turning south and running into the Atlantic Ocean. The Ilulissat Icefjord was declared a UNESCO World Heritage Site in 2004." - in: wikipedia