A pedestrian walks past one of many intricate pieces of street art in Dublin, Ireland.
       
     
 Giant sequoia's tower over tall trees throughout Sequoia National Park in southern California.
       
     
 Boats docked at Embarcadero Marina in San Diego, California during sunset on Monday December 18, 2017.
       
     
 A Galapagos shark swims off the coast of Haleiwa, Oahu
       
     
 A man smokes on the deck of a ferry from Dublin, Ireland to Holyhead, Wales.
       
     
 Elk gather in a meadow in Orick, California on Friday December 22, 2017.
       
     
 Gondola drivers wait at a dock for their next customers in Venice, Italy; Sept. 2014.
       
     
 A lightening storm over Venice, Italy.
       
     
 Street performers dance to traditional Irish music in the Temple Bar area of Dublin, Ireland.
       
     
 A street performer break-dances in London, England
       
     
 Venice, Italy
       
     
 A pedestrian walks past one of many intricate pieces of street art in Dublin, Ireland.
       
     

A pedestrian walks past one of many intricate pieces of street art in Dublin, Ireland.

 Giant sequoia's tower over tall trees throughout Sequoia National Park in southern California.
       
     

Giant sequoia's tower over tall trees throughout Sequoia National Park in southern California.

 Boats docked at Embarcadero Marina in San Diego, California during sunset on Monday December 18, 2017.
       
     

Boats docked at Embarcadero Marina in San Diego, California during sunset on Monday December 18, 2017.

 A Galapagos shark swims off the coast of Haleiwa, Oahu
       
     

A Galapagos shark swims off the coast of Haleiwa, Oahu

 A man smokes on the deck of a ferry from Dublin, Ireland to Holyhead, Wales.
       
     

A man smokes on the deck of a ferry from Dublin, Ireland to Holyhead, Wales.

 Elk gather in a meadow in Orick, California on Friday December 22, 2017.
       
     

Elk gather in a meadow in Orick, California on Friday December 22, 2017.

 Gondola drivers wait at a dock for their next customers in Venice, Italy; Sept. 2014.
       
     

Gondola drivers wait at a dock for their next customers in Venice, Italy; Sept. 2014.

 A lightening storm over Venice, Italy.
       
     

A lightening storm over Venice, Italy.

 Street performers dance to traditional Irish music in the Temple Bar area of Dublin, Ireland.
       
     

Street performers dance to traditional Irish music in the Temple Bar area of Dublin, Ireland.

 A street performer break-dances in London, England
       
     

A street performer break-dances in London, England

 Venice, Italy
       
     

Venice, Italy