Almost 70 years after it was conceived, and 17 years after construction started, the world’s largest train tunnel is to open tomorrow in Switzerland. Dug under the Alps, the 35-mile Gotthard Base Tunnel is expected to streamline and increase rail traffic between northern and southern Europe.
In the early days of space flight, the pictures harvested by the National Aeronautic and Space Administration (NASA) were blurry gray images that resembled a bad weather map. With the advent of new technology and better platforms to photograph from, such as the space shuttle and International Space Station, NASA is able to provide us with an amazing viewpoint of Earth.
In honor of Earth Day, view memorizing photos of the blue planet from space.