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The troops of Holy Roman Emperor Charles V — unpaid, mutinous, and beyond anyone's control — sacked Rome in one of the most destructive episodes of the Renaissance. Some 20,000 people died. The Pope fled through a secret passage. Artists, scholars, and clerics scattered across Europe. It is considered the effective end of the High Renaissance, caused largely by an army whose own commander couldn't stop them.

Dutch colonial director Peter Minuit completed the purchase of Manhattan island from the Lenape people for approximately sixty guilders worth of trade goods. Whether the Lenape understood they were selling permanent title — rather than agreeing to share use of the land — is a matter historians still debate. What is not debated is that it became the most consequential real estate transaction in American history.

The Penny Black went on sale in Great Britain on May 6, 1840, becoming the world's first adhesive postage stamp. For one penny, a letter could be sent anywhere in the country — a radical democratization of communication at a time when postage had previously been paid by the recipient, at wildly inconsistent rates. It bore the profile of Queen Victoria. She was nineteen.

Sigmund Freud was born on May 6, 1856, in what is now the Czech Republic. He would go on to develop psychoanalysis, reshape how Western civilization thought about the human mind, generate decades of fierce academic debate, and give the world a vocabulary for experiences it had always had but never quite named. Whether all of it holds up scientifically is still being argued. That he changed things is not.

President Chester Arthur signed the Chinese Exclusion Act, prohibiting Chinese laborers from entering the United States. It was the first — and for decades the only — federal law to exclude a specific nationality from immigration. It would remain in effect, in various forms, until 1943. The transcontinental railroad those laborers had largely built was by then thirty years old.

The Eiffel Tower opened to the public on May 6, 1889, having been completed just weeks earlier for the World's Fair. Parisian artists and intellectuals had loudly protested its construction, calling it a blot on the city's skyline. It has since been visited by more than 300 million people and is arguably the most recognized structure on earth. The protesters are not remembered.

The German airship Hindenburg burst into flames while attempting to dock at Naval Air Station Lakehurst, killing thirty-six people and destroying the era of commercial airship travel in approximately thirty-four seconds. The disaster was captured on film and recorded live by radio correspondent Herb Morrison, whose anguished narration became one of the most replayed broadcasts in history. Hydrogen, it turned out, was a poor choice.

Roger Bannister ran a mile in 3 minutes 59.4 seconds at Oxford's Iffley Road track, becoming the first human being to break the four-minute mile — a barrier many had considered physiologically impossible. Six weeks later, Australian John Landy broke Bannister's record. Within three years, sixteen runners had done it. The barrier, once broken, turned out to have been mostly psychological.

Princess Margaret married photographer Antony Armstrong-Jones at Westminster Abbey on May 6, 1960, in the first royal wedding broadcast on British television. An estimated 300 million people watched worldwide. The marriage lasted eighteen years. The broadcast changed how the world consumed royal events permanently.

The Channel Tunnel — 31 miles of undersea passage connecting Britain and France — was formally inaugurated by Queen Elizabeth II and French President François Mitterrand on May 6, 1994. The idea had been proposed as early as 1802 by a French engineer who suggested it to Napoleon. Napoleon, who had other priorities regarding Britain, passed.

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