6 Countries That Changed Their Capitals
Capital cities are often the same for centuries, but some national capitals are significantly newer, with countries choosing to move the seat of government to an entirely different city. Here's an inside look at why six countries changed their capitals.
7 of the World's Longest Tunnels (And How They Were Built)
Since the invention of the tunnel boring machine (TBM) in 1853, engineers have used advancing technology to drill, blast, and bore into the earth. Here’s a peek into the construction of seven of the world’s longest tunnels for railways and automobiles.