Ocean Liners
R.M.S. Titanic
Perhaps one of the famous ship of all time is the R.M.S Titanic of the White Star Line. When the Titanic was completed, she was the largest liner in the world and was dubbed "unsinkable". On the night of April 14-15, 1912, she was no more. She struck an iceberg in the North Atlantic while on her maiden voyage from Southampton to New York and sank to the bottom of the ocean. 1503 lives were lost and 700 survived. She remains the most famous ship in the history of ocean travel.
R.M.S. Olympic
Built before the Titanic, the Olympic was the first of the Olympic class ships built by Harland and Wolff of the White Star Line.  She was a marvelous and luxurious ship.  During World War I, she was re-fitted for war service and was transferring troops across the Atlantic.  After the war, she was serviced back into regular service for the White Star Line and remained a cruise ship till the 1930s.  In 1935, she was sold and scrapped because she was getting too old and couldn't compete the Transatlantic run.  Because of her outstanding achievement and record, she earned the nick-name "Old Reliable".   She lived longer than both of her sisters and remained one of the best ship ever made.
R.M.S. Britannic (Gigantic)
The last Olympic class ship.  She was initially called Gigantic, but with the advent of the sinking of the Titanic, she was renamed to a more proper name - Brittanic.  She was a bit longer than Titanic and was built for the Transatlantic run.  However, upon completion, she became a wartime hospital ship and was serviced for World War I.  Like the fate of the Titanic, she also met an end.  She sank in the Aegean Sea after striking a German mine on November 21, 1916.
R.M.S. Lusitania
The Lusitania was built in 1907 by John Brown & Company in Clydebank, Scotland for the Cunard Line.  She and the Mauretania were the fastest ocean liners of the time when they made their transatlantic run.  Steam turbine with quadruple screws, she exceeded a speed of 25 knots.  Sadly, on May 7, 1915, she was sunk by a German torpedo off the coast of Ireland near 'The Old Kinsale'.  She was believed to be carrying ammunitions for the British.  1198 lives were lost including 124 Americans.  Her sinking was an outrage and was a catalyst that brought the U.S. into World War I with Germany.
R.M.S. Mauretania
One of the best four-stackers in the history of ocean travel.  Built in 1907 for the Cunard Line, she quickly became the world's fastest ocean liner from 1907-1929, which captured the Blue Riband for almost 20 years.  She and the Lusitania was, as they called it, "the greyhounds of the sea".  During World War I, she was refitted for wartime service from 1914-1918.  After the war, she was painted white and was used primarily as a cruise ship.  The Golden Era was over and she was getting too old.  In 1935, she was scrapped in Scotland, the same year the Olympic was scrapped.  She will be always be remembered for speed.
R.M.S. Aquitania
R.M.S. Queen Mary