A very low tide early in the morning along the St. Croix River at Calais, Maine.

Mallards along a tributary of the Patuxent River.

A mute swan nest.

Mute swan eggs.

Mute swan guarding its nest.

Mute swan guarding its nest in an agressive posture.

A juvenile terrapin poking its head up for a look around.

Point Lobos area south of Carmel.

A secluded beach at the base of cliffs along the Big Sur coastline.

The famous Cypress Point along Seventeen Mile Drive.

Aerial view of downtown Philadelphia and the Philadelphia waterfront showing what was then the world's largest suspension bridge. In "Philadelphia: Birthplace of Liberty" a sesqui-scentennial souvenir booklet.

The League Island Navy Yard. In "Philadelphia: Birthplace of Liberty" a sesqui-scentennial souvenir booklet.

The construction cranes in League Island Navy Yard. In "Philadelphia: Birthplace of Liberty" a sesqui-scentennial souvenir booklet.

Cover of Philadelphia Sesqui-centennial souvenir booklet: "Philadelphia: Birthplace of Liberty".

Coastal erosion on a barrier island.

An encroaching sea with increasing sea level relentlessly attacks a barrier island.

Coastal erosion as increasing sea level causes relentless and certain migration and destruction of barrier islands.

Coastal erosion as increasing sea level causes relentless and certain migration and destruction of barrier islands.

Attempts to stem coastal erosion stemming from rising sea level and periodic migration of sand on barrier islands and coastal dunes.

Attempts to stem coastal erosion stemming from rising sea level and periodic migration of sand on barrier islands and coastal dunes.

Mangrove trees help protect the coast as they help stem erosion as well as provide habitat for innumerable marine species.

Boca Chita Key Lighthouse in Biscayne National Park.

Outer Island Lighthouse with sun reflecting off the cupola glass.

Shipwreck near shore in the Apostle Islands.

Fourteen Foot Bank Lighthouse on Delaware Bay.

Biscayne National Park. The perfect palm tree.

Heavy seas often sweep this old Coast Guard pier that was used to service the Cape Decision Lighthouse.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Entrance to San Juan Harbor

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Coastal scene in southern Alaska.

Looking NW from Point Conception.

The Point Conception Lighthouse.

The Point Conception Lighthouse.

The Point Conception Lighthouse.