An obelisk on the beach to guide ships in up the salt, with old slave huts behind, near South Point, Bonaire, Antilles, West Indies, Caribbean, Central America

Lighthouse at Happisburgh, Norfolk coast, United Kingdom

Lighthouse at Happisburgh, Norfolk coast, United Kingdom

A Greenland tour guide wearing a colourful jacket onboard a ship infront of the Eqi glacier, Greenland, Polar Regions

Tug boat navigating the newly launched Celebrity Equinox from the Meyer Werft along the River Ems, Lower Saxony, Germany

Tug boat navigating the newly launched Celebrity Equinox from the Meyer Werft along the River Ems, Lower Saxony, Germany

Tug boat navigating the newly launched Celebrity Equinox from the Meyer Werft along the River Ems, Lower Saxony, Germany

Guide from river cruise ship prays with Buddhist monks in the temple, Preah Prosop, Mekong River, Kandal, Cambodia, Asia

Diving guide and shark cage, Guadalupe, Mexico, Pacific ocean, North America

Guide prepares fish head for shark feeding, Guadalupe, Mexico, Pacific ocean, North America