The Great Wall of China was built to defend the empire from enemy armies, but now it acts as a unifying symbol and a useful propaganda tool for the ruling Communist Party.
Istanbul has had many names, including Byzantium, New Rome and Constantinople. It didn't officially become Istanbul until 1930.
The aging process doesn't happen equally on both sides, leaving the human face increasingly less symmetrical with age.
New evidence shows that watermelons were first domesticated in Sudan, leading experts to think the region rivals Iraq as a cradle of agriculture.
While often strained, the U.K.-U.S. relationship got a boost when Roosevelt and Churchill became drinking buddies.
It's impossible to know for sure the deadliest day in U.S. history because you can end up comparing apples with oranges.
It was either because New Year's Day used to be March 1 or because the Romans used to have a 10-month calendar.