Surtshellir

Víðgelmir is a lava tube situated in Western Iceland in the H

Barnafossar is also known as Bjarnafossar, which was its previous

Hraunfossar (Borgarfjörður, western Iceland) is a series of w

Deildartunguhver is a hot spring in Reykholtsdalur, Iceland. It is

The waterfall Glymur, with a cascade of 196 m, is the highest

גייזר הוא מעיין מים חמים המתפרץ תקופתית, ומעלה לאוויר עמו

Strokkur (Icelandic for 'churn') is a geyser in the geothermic region

The Salt Cathedral of Zipaquirá (Spanish: Catedral de Sal de

Karaca Cave (Turkish: Karaca Mağarası) is a network of caves l

Batu Caves is a limestone hill, which has a series of caves and cave

Saeva dupka (Bulgarian: Съева дупка) is a cave in Northern Bulgaria

מכרות המלח בוְויֶילִיצְ'קַה (בפולנית: Kopalnia soli Wieliczka; בגרמנ