One of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia

One of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia

Young woman avoiding deep snow to reach park bench in snowy Tromso, Norway

Craig Goch reservoir at Elan Valley, Powys, Wales

Kelimutu crater, Indonesia

Fjadrargljufur is a magnificent and massive canyon, about 100 meters deep and about two kilometres long. The canyon has sheer walls; Skaftarhreppur, Southern Region, Iceland

Fjadrargljufur is a magnificent and massive canyon, about 100 meters deep and about two kilometres long. The canyon has sheer walls; Skaftarhreppur, Southern Region, Iceland

Surgeonfish aggregate on the north coast of Komodo Island. Surgeonfishes are small-scaled, with a single dorsal fin and one or more distinctive, sharp spines that are located on either side of the tail base and can produce deep cuts. They are primarily algae eaters, Komodo Island, Indonesia

Close Up Of Apples Growing On A Tree Against A Deep Blue Sky, Calgary, Alberta, Canada

Apples Growing On A Tree Against A Deep Blue Sky, Calgary, Alberta, Canada

An aerial view of the live aboard vessel Infiniti for scuba diving off Balicasag Island, a tiny island in South West Bohol in the central Philippines. It is famous for scuba diving on the deep, vertical walls and there are some fantastic hard coral gardens at snorkeling depths, Balicasag Island, Philippines

An aerial view of Balicasag Island, a tiny island in South West Bohol in the central Philippines. It is famous for scuba diving on the deep, vertical walls and there are some fantastic hard coral gardens at snorkeling depths, Balicasag Island, Philippines

Aerial view of marsh

Redwood Trees in Muir Woods California USA

Aerial view of marsh

Aerial view of marsh

Redwoods Muir Woods California

Aerial view of marsh

Aerial view of marsh

Snow covered pine trees