A year shy of its 90th anniversary, experts still marvel at the construction of the Hoover Dam, one of the most visited sites in the world.

The 726-foot-high arch-gravity dam stretches 1,244 feet across the Black Canyon and was built over five years starting in 1931, helping provide water and hydroelectrical power to the West.

Less maintenance, less danger and fewer negative impacts on natural flora and fauna are all among the reasons it might be ...

Spanning more than 100 metres across and 20 metres high, the Stones Arch Dam at Jones Falls has been standing strong for nearly two centuries. Also called the "whispering dam," visitors can stand ...

Less maintenance, less danger and fewer negative impacts on natural flora and fauna are all among the reasons it might be ...

From here, rigging was reconfigured to prepare for final operations, then each piece was lifted off the ground and lowered ...