Lunge-feeding fin whale (Balaenoptera physalus) showing distended throat grooves, Northeast Atlantic, off Morocco, North Africa, Africa

Entrance, west pylons, grooved to hold 8 flagstaffs, unfinished stonework, 142ft high, 372ft long, Ptolemaic period, Temple of Ammon, Karnak, Luxor, Thebes, Egypt, North Africa, Africa

Slickrock, Zion National Park, Utah, United States of America, North America

An old stone grist mill in the ancient town of Furong, China.

Grooved Brain Coral

Grooved Brain Coral

Graphic detail of the twists and polyps of Grooved Brain Coral (Diploria labyrinthiformis), Barrier Reef, San Pedro, Ambergris Cay Island, Belize, Central America, Caribbean

Corals underwater, Grooved-blade sea whip (Pterogorgia guadalupensis), Deep Water Gorgonian (Iciligorgia Schrammi), Orange Elephant Ear Sponge (Agelas Clathrodes), Cayman Islands, West Indies

A close look at the detail of Brain coral (Platygyra sinensis) during the day with the its polyps closed, Yap, Federated States of Micronesia

USA, California, Joshua Tree National Park, Rock formations, USA, California, Joshua Tree National Park

USA, California, Joshua Tree National Park, Rock formations, USA, California, Joshua Tree National Park