Here’s a look at some interesting events that took place on this day in history:

1888 – The Washington Monument officially opens to the general public (More info)

1936 – Harnessing the power of the Colorado River, Hoover Dam begins sending electricity over transmission lines spanning 266 miles (More info)

1963 – In northeast Italy, a landslide leads to the deaths of more than 2,000 people when it causes a sudden and massive wave of water to overwhelm the Vajont Dam (More info)

1967 – Marxist revolutionary Ernesto "Che" Guevara is executed for attempting to incite a revolution in Bolivia (More info)

2006 – North Korea allegedly tests its first nuclear device (More info)