Once the world's tallest building and now, again, the tallest building in New York City's Manhattan Borough - the Empire State Building turned 75 Monday.

The steel and aluminum building flashed plain white lights to mark the occasion, as it did when President Herbert Hoover flipped the switch on May 1, 1931.

The 443-meter-high building took a year and 45 days to build, in the midst of the Great Depression. The building was considered an engineering feat in its day and still attracts thousands of tourists every year.

The Empire State Building lost the title of tallest Manhattan building in 1972 to the twin towers of the World Trade Center, but regained it when they were destroyed by terrorist-driven commercial airplanes on September 11, 2001.

Some information for this report provided by Reuters and AP.