A journey to the center of the Earth by be*curious, via Flickr - France / Languedoc-Roussillon / GROTTE DE LIMOUSIS The largest developed cave in Aude. It is made up of eight chambers and a series of five stalagmite barriers and a large number of concretions. The last chamber houses an exceptional mass of aragonite crystals, known as the Chandelier, 4 metres in height and 10 metres round.
The Park, Nottingham, UK - The Park is one of the most beautiful Victorian estates in the country, laid out by the Duke of Newcastle, no less, a listed and conservation area. You can still see the earliest Regency designs for stuccoed villas around the fringes, though most of it is late 19th-century.
The historical region of Cappadocia where Derinkuyu is situated, contains several historical underground cities, Derinkuyu-carved out of a unique geological formation, many of which were largely re-used by early Christians as hiding places.