Timeline of 9/11 Attacks at World Trade Center, Pentagon, Flight 93

Just moments before his own plane was hijacked, Flight 175 pilot Victor J. Saracini alerted the Federal Aviation Administration to a strange message from Flight 11. September 11 lives on in the American conscience as a day in which heroic acts of bravery reverberated through unimaginable tragedy.

Lesser-Known Ruins of the Ancient World

While most everyone is familiar with Angkor Wat, Petra or Rome's Colosseum, it is sometimes the overlooked cities—once megalopolises now in disrepair—that tell a more potent story.

10 Queer Rebellions Before Stonewall

Stonewall is seen as the birth of the LGBT rights movement. But there were pickets, protests—even riots—in the years before June 28, 1969.

The History of Juneteenth

While not a national holiday, it is observed in the majority of American states by members of the black and POC community.

America's 11 Most Endangered Historic Places

This year's roster includes Nashville's Music Row, the National Mall Tidal Basin, postmodern and Art Deco skyscrapers, and sites connected to African-American history.

The First New York City Pride Parade

Exactly one year after Stonewall, Christopher Street Gay Liberation Day was the world's first official Pride celebration. But it almost didn't happen.

Only Royals Have Seen This Part of the Forbidden City

Until now, the Qianlong Garden, which includes elaborate rock gardens and more than two dozen pavilions and structures from the most extravagant dynasty in imperial China - has only been seen by royal eyes. That all changes in 2020. 

Who Are the World's Longest-Serving Heads of State?

Algerian President Abdelaziz Bouteflika's decision to resign early came weeks after Kazakh President Nursultan Nazarbayev ended his own decades-long reign, but many other leaders seem set to stay.

Russia's New Super Tank Now Comes With a Toilet

The T-14 Armata has been fitted with "the so-called life support system or, simply speaking, a lavatory," said Ilya Baranov, the director at the Urals Design Bureau of Transport Machine-Building.