Thirteen years ago, the United States was attacked and we were shocked, numb, angry - basically every emotion. Immediately, countries around the world showed their sympathy in incredible ways.
American flags appeared everywhere.
St. Petersburg, Russia
The U.S. Embassies around the world were flooded with support.
Firefighters in Frankfurt, Germany bowed their heads.
There were supportive messages, too.
Seriously, the world was covered in flowers.
Seoul, South Korea
And candles. There were lots of candles.