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Prominent landmarks like the Empire State Building in New York City and Terms of servicethe Eiffel Tower in Paris went dark Monday in honor of the victims of Sunday night's mass shooting in Las Vegas.

Stephen Paddock fired into a country music festival that left at least 58 people dead and over 500 injured in Las Vegas on Sunday night. It's considered the deadliest mass shooting in modern U.S. history.

The Empire State Building and One World Trade Center shined only an orange halo to bring awareness to gun violence. "Tonight our lights darken for the victims & those affected by the Las Vegas attack," the Empire State Building account tweeted.

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The Eiffel Tower, on the other hand, was completely dark for both Las Vegas and Marseille victims. On Sunday, two women were fatally stabbed by a man at the French port city.

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Other landmarks like the Space Needle in Seattle and the famous Las Vegas strip stood dark to paid tribute to the victims.

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On Monday, many world leaders, celebrities and the military participated in vigils and sent condolences to those effected by the tragedy.

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