The Titanic sank in the North Atlantic off Newfoundland in April 1912.
London, England -- From a Belfast cathedral to a ship in the cold North Atlantic, thousands are gathering to remember RMS Titanic, 100 years after the sinking of the luxury liner.
The ship, on its maiden voyage, struck an iceberg at 11:40 p.m. on April 14, 1912, and sank less than three hours later.
More than 1,500 of the 2,208 passengers and crew died.
In Belfast, where Titanic was built, thousands will attend a concert at the city's Waterfront Hall or a requiem mass at St. Anne's Cathedral on Saturday.
Aboard the cruise ship MS Balmoral, which is retracing the Titanic's route passengers and crew will hold ceremonies at the site of the disaster, 400 miles off the coast of Newfoundland.
Another cruise ship, Journey, will join Balmoral at the site.