The Enola Gay dropping the bomb on Hiroshima, August 6, 1945.

On this day in 1945, at 8:16 a.m. Japanese time, an American B-29 bomber, the Enola Gay, drops the world’s first atom bomb, over the city of Hiroshima. Approximately 80,000 people are killed as a direct result of the blast, and another 35,000 are injured. At least another 60,000 would be dead by the end of the year from the effects of the fallout

On this day in 1799, during Napoleon Bonaparte’s Egyptian campaign, a French soldier discovers a black basalt slab inscribed with ancient writing near the town of Rosetta, about 35 miles north of Alexandria. The irregularly shaped stone contained fragments of passages written in three different scripts: Greek, Egyptian hieroglyphics and Egyptian demotic. The ancient Greek on the Rosetta Stone told archaeologists that it was inscribed by priests honoring the king of Egypt, Ptolemy V, in the second century B.C. More startlingly, the Greek passage announced that the three scripts were all of identical meaning. The artifact thus held the key to solving the riddle of hieroglyphics, a written language that had been “dead” for nearly 2,000 years.

When Napoleon, an emperor known for his enlightened view of education, art and culture, invaded Egypt in 1798, he took along a group of scholars and told them to seize all important cultural artifacts for France. Pierre Bouchard, one of Napoleon’s soldiers, was aware of this order when he found the basalt stone, which was almost four feet long and two-and-a-half feet wide, at a fort near Rosetta. When the British defeated Napoleon in 1801, they took possession of the Rosetta Stone.

Several scholars, including Englishman Thomas Young made progress with the initial hieroglyphics analysis of the Rosetta Stone. French Egyptologist Jean-Francois Champollion (1790-1832), who had taught himself ancient languages, ultimately cracked the code and deciphered the hieroglyphics using his knowledge of Greek as a guide. Hieroglyphics used pictures to represent objects, sounds and groups of sounds. Once the Rosetta Stone inscriptions were translated, the language and culture of ancient Egypt was suddenly open to scientists as never before.

The Rosetta Stone has been housed at the British Museum in London since 1802, except for a brief period during World War I. At that time, museum officials moved it to a separate underground location, along with other irreplaceable items from the museum’s collection, to protect it from the threat of bombs.

On June 16, 1884, the first roller coaster in America opens at Coney Island, in Brooklyn, New York. Known as a switchback railway, it was the brainchild of LaMarcus Thompson, traveled approximately six miles per hour and cost a nickel to ride. The new entertainment was an instant success and by the turn of the century there were hundreds of roller coasters around the country.

Coney Island, a name believed to have come from the Dutch Konijn Eilandt, or Rabbit Island, is a tract of land along the Atlantic Ocean discovered by explorer Henry Hudson in 1609. The first hotel opened at Coney Island in 1829 and by the post-Civil War years, the area was an established resort with theaters, restaurants and a race track. Between 1897 and 1904, three amusement parks sprang up at Coney Island–Dreamland, Luna Park and Steeplechase. By the 1920s, Coney Island was reachable by subway and summer crowds of a million people a day flocked there for rides, games, sideshows, the beach and the two-and-a-half-mile boardwalk, completed in 1923.

The hot dog is said to have been invented at Coney Island in 1867 by Charles Feltman. In 1916, a nickel hot dog stand called Nathan’s was opened by a former Feltman employee and went on to become a Coney Island institution and international franchise. Today, Nathan’s is famous not only for its hot dogs but its hot dog-eating contest, held each Fourth of July in Coney Island. In 2006, Takeru Kobayashi set a new record when he ate 53.75 hot dogs with buns in 12 minutes.

Roller coasters and amusement parks experienced a decline during the Great Depression and World War II, when Americans had less cash to spend on entertainment. Finally, in 1955, the opening of Disneyland in Anaheim, California, signaled the advent of the modern theme park and a rebirth of the roller coaster. Disneyland’s success sparked a wave of new parks and coasters. By the 1970s, parks were competing to create the most thrilling rides. In 2005, Six Flags Great Adventure in Jackson, New Jersey, introduced the Kingda Ka roller coaster, the world’s tallest (at 456 feet) and fastest (at 128 mph).

By the mid-1960s, the major amusement parks at Coney Island had shut down and the area acquired a seedy image. Nevertheless, Coney Island remains a tourist attraction and home to the Cyclone, a wooden coaster that made its debut there in 1927. Capable of speeds of 60 mph and with an 85-foot drop, the Cyclone is one of the country’s oldest coasters in operation today. Though a real-estate developer recently announced the building of a new .5 billion year-round resort at Coney Island that will include a 4,000-foot-long roller coaster, an indoor water park and a multi-level carousel, the Cyclone’s owners have said they plan to keep the historic coaster open for business.

On May 27, 1941, the British navy sinks the German battleship Bismarck in the North Atlantic near France. The German death toll was more than 2,000.

On February 14, 1939, the 823-foot Bismarck was launched at Hamburg. Nazi leader Adolf Hitler hoped that the state-of-the-art battleship would herald the rebirth of the German surface battle fleet. However, after the outbreak of war, Britain closely guarded ocean routes from Germany to the Atlantic Ocean, and only U-boats moved freely through the war zone.

In May 1941, the order was given for the Bismarck to break out into the Atlantic. Once in the safety of the open ocean, the battleship would be almost impossible to track down, all the while wreaking havoc on Allied convoys to Britain. Learning of its movement, Britain sent almost the entire British Home Fleet in pursuit. On May 24, the British battle cruiser Hood and battleship Prince of Wales intercepted it near Iceland. In a ferocious battle, the Hood exploded and sank, and all but three of the 1,421 crewmen were killed. The Bismarck escaped, but because it was leaking fuel it fled for occupied France. On May 26, it was sighted and crippled by British aircraft, and on May 27 three British warships descended on the Bismarck and finished it off.

On May 10, 1869, the ceremonial spike (actually more than one) was driven into the meeting point of the Union Pacific Railroad and the Central Pacific Railroad. That’s when it became the transcontinental railroad, and traveling across the country no longer meant months in a wagon or on a ship sailing around South America.