European exploration began long before Columbus.
This incredible animated map shows how Europeans explored and mapped the world over 1,200 years, from Viking voyages to the first photographs of Earth from space.
Watch the map come to life!
Everyone knows how the Twin Towers came down 25 years ago on 9/11/2001.
But few people know how they went up, and how they changed New York forever.
This is the remarkable history of the World Trade Center. 🧵