What the Sydney Opera House almost looked like, and other alternative…

In 1758, 48 years before Napoleon commissioned the Arc de Triomphe, the architect Charles-François Ribart proposed constructing an elephant-shaped building on the very site where the future arc would stand. It's just one of the many possible alternatives for the familiar landmarks we see today. » 9/29/12 9:00am 9/29/12 9:00am

What it's like to be trapped in the Washington Monument during an…

Last month's earthquake in Virginia rattled the 555-foot-tall Washington Monument such that it's been closed indefinitely so engineers can assess damage. Buildings all across the Eastern Seaboard were rocked on August 23, but the Monument's security camera footage shows that people visiting the famous obelisk had a… » 9/27/11 7:20am 9/27/11 7:20am

Mount Rushmore Gets a Virtual Backup — In Case It's Ever Destroyed

If invading Martians or raging Kryptonians ever destroy the faces of Mount Rushmore, at least we'll have a backup to work from. A team of Scottish scientists are teaming up with the American company CyArk to create a 3D model of the monument, which CyArk claims will be accurate within 3mm, in case archeologists ever… » 8/27/09 4:30pm 8/27/09 4:30pm