National monuments are areas of federal land protected for their significant historical, cultural, or scientific importance.

The Hoover Dam was finished in 1936. It took roughly five years to complete the massive dam located along the Nevada-Arizona border, which was originally named the Boulder Dam before getting its new ...

Around 10,000 muons pass through each square meter of Earth’s surface every minute, creating a natural particle shower that researchers are now using to read the interiors of monuments without cutting ...