Revellers take part in the Notting Hill Carnival in London, Britain on August 27, 2018. The carnival has been held every year since 1966 and one of the largest festival celebrations of its kind in Europe. (Photo by Henry Nicholls/Reuters)

Members of Brazil's Movimento dos Sem-Teto (Roofless Movement) stand in the hallway of one of the 11 empty buildings that the movement took over recently, in the centre of Sao Paulo, November 6, 2012. According to City Hall, there are some 400,000 people in need of stable housing, including the 4,000 families of the Roofless Movement who are squatting in abandoned or vacant buildings that range from apartment blocks to hotels, in Sao Paulo, the largest city in South America. (Photo by Nacho Doce/Reuters)

Masked participants stand in St.Mark's Square during the Carnival on February 10, 2007 in Venice, Italy. (Photo by Marco Di Lauro). P.S. All pictures are presented in high resolution.

A performer is covered in chocolate sauce at the Notting Hill Carnival on August 28, 2011 in London, England. The annual carnival, which is the largest of it's kind in Europe and is expected to attract around 1 million revellers, has taken place every August Bank Holiday since 1966. (Photo by Oli Scarff/Getty Images)

Samba dancers walk past a security staff member during the 34th annual Asakusa Samba Carnival in Tokyo August 29, 2015. About 5,000 people participated in the annual samba carnival on Saturday. (Photo by Toru Hanai/Reuters)

A masked reveller poses along the flooded St. Mark's Square during a period of seasonal high water and on the first day of carnival, in Venice February 1, 2015. (Photo by Stefano Rellandini/Reuters)

A man from the Dominican Republic wears a devil mask while dancing in the street during Carnival celebrations in Panama City, Monday, February 16, 2015. (Photo by Arnulfo Franco/AP Photo)

An aerial view shows the the Mountain Bike course at the X-Park at Deodoro Olympic Park ahead of the 2016 Rio Olympics in Rio de Janeiro, Brazil, July 16, 2016. (Photo by Ricardo Moraes/Reuters)