Coral encrusted porthole on the Lesleen M wreck, a freighter sunk as an artificial reef in 1985 off Anse Cochon Bay, St. Lucia, West Indies, Caribbean, Central America

Rear view of person looking at traditional Rorbu cabins seen through a porthole, Reine Bay, Lofoten Islands, Norway, Scandinavia, Europe

A lifeboat in Mallaig, Highlands, Scotland, United Kingdom, Europe

Sunset view through window on deck of cruise ship MS Deutschland (Reederei Peter Deilmann), Caribbean Sea, near Mexico

Steward, crew, sun deck, cruise ship MS Delphin Renaissance, Cruise Bremerhaven, South England, England

Airplane in silhouette, sun through window in sky, sunset B1177

City skyline reflected in ferry porthole, Seattle, Washington, United States, Seattle, Washington, USA

Sleeper in boat cabin

Living area in lighthouse

Porthole of red nautical vessel