Hoover Dam Construction: For decades, St Thomas, Nevada, remained hidden beneath the waters of Lake Mead after the construction of Hoover Dam transformed the Colorado River and submerged the historic settlement.
Now, as Lake Mead's water levels continue to decline, the former Mormon town has emerged once again. Its old streets, foundations and building remains are visible, allowing visitors to walk through parts of a community that was once around 60 feet (18 metres) beneath the lake's surface.