Monastery Santa Maria Real de las Huelgas1. Burgos. Spain

Herschel telescope in the real astronomical Observatory. Madrid. Spain

Cloister of the Monastery Santa Maria Real de las Huelgas. Burgos. Spain

Cloister of the Monastery Santa Maria Real de las Huelgas1. Burgos. Spain

Gili farm all green community ,NANTOU CITY TAIWAN

Harvestmen Cave skylight [2]

Whispering Waterfall Cave

Inside snow cave, Patagonia, Chile

Harvestmen Cave [2]

Facade in the Güllüdere valley, Cappadocia, Turkey

Cappadocian Landscape, Goereme, Turkey

Cheese Cave [4]

Village of Çavuşin, Cappadocia, Turkey

Layser Cave (exterior)

Layser Cave (interior)

Gwinn Cave (interior)[3]

Karst cave (interior)

aerial panorama over the ridge on a cloudy day over the ridge surrounded by low mountains of the Western Caucasus (South of Russia), overgrown with forest. Not far from the Wolf Gate gorge

Butter Cave entrance [2]

Frasassi Cave - La Sala delle Candeline

Jack Jones Annex Cave (interior)[2]

LBNM: Big Ice Cave entrance

Gwinn Cave (interior)[2]

Gwinn Cave (exterior)