The Trulli houses of Alberobello in the Puglia region of Italy were built by settlers from limestone and not much else. An impressive dry stone building technique meant the houses could be collapsed simply by pulling out a keystone.
This is Catania and Mount Etna in Sicily, Italy. Catania is a city in Sicily and Mount Etna is one of the most active volcanoes in the world. This picture was captured during the winter when the volcano was covered with snow.