Cracked limestone ledges at Kilve in Somerset, England, United Kingdom, Europe

Limestone ledges and Clavell Tower, Kimmeridge Bay, Jurassic Coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

A woman looks out across the hills of Catalonia from a rock ledge near the village of Siuarana, near Reus and Barcelona, Catalonia, Spain, Europe

A woman looks out across the hills of Catalonia from a rock ledge near the village of Siuarana, near Reus and Barcelona, Catalonia, Spain, Europe

Geological Devil's Bridge, a natural arch carved by the sea from soft and hard limestone ledges of the Antigua formation, Antigua, Leeward Islands, West Indies, Caribbean, Central America

Limestone ledges at Slade Sands on the Gower in winter, South Wales, United Kingdom, Europe

Devil's Bridge, a natural arch carved by the sea from soft and hard limestone ledges of the Antigua formation, St. Johns, Antigua, Leeward Islands, West Indies, Caribbean, Central America

Gravel beach and the famous Koenigsstuhl chalk cliff on the Baltic Sea, Nationalpark Jasmund national park, Ruegen island, Mecklenburg-Western Pomerania, Germany Europe

Two cave explorers traverse a section of cave on a ledge above a deep hole.

Two cave explorers traverse a section of cave on a ledge above a deep hole.