The National September 11 Memorial & Museum (branded as 9/11 Memorial and 9/11 Memorial Museum) is the principal memorial and museum commemorating the September 11 attacks of 2001, which killed nearly 3,000 people, and the World Trade Center bombing of 1993, which killed six. The memorial is located at the World Trade Center site, on the former location of the Twin Towers, which were destroyed during the attacks. The World Trade Center Memorial Foundation was renamed the National September 11 Memorial & Museum at the World Trade Center in 2007.

Every year, in the Rostov region of Russia, a group of 40 young and not so young rural workers compete in the Bison Track Show, or more affectionately known as: Russian Flying Tractor Racing. In front of crowds numbering up to 30,000 people, a series of smoke spilling, monstrous farming machines tear round an 8km mud track, plowing through lakes and dirt mounds, their turbos screaming and tyres scrabbling to find grip.

Amazing gravity-defying photo manipulations by Ravshaniya, a photographer from Uzbekistan, teeters on the edge of levitation. Photo: Untitled. (Photo by Ravshaniya)

A shorn alpaca walks in a grass field at Alpaca-Land farm in Unken in the Austrian province of Salzburg, Sunday July, 6, 2014. The annual shearing makes the animals more comfortable for the summer months. (Photo by Kerstin Joensson/AP Photo)

Using body paint and a woodland like location, Gesine appears to have created a model to look just like a red panda, Dortmund, Germany, October, 2016. An artist brings animals to life using body paint and contorted models. At first glance, these images could be mistaken for portraits of wildlife in their natural habitat were created with paper and paint. However, they are actually the incredible works of illusion by talented body painter Gesine Marwedel, who paints models to creates realistic animals. (Photo by Gesine Marwedel/Barcroft Images)

A girl in a swimsuit participates in the BoogelWoogel alpine carnival at the Rosa Khutor Alpine Resort in Krasnaya Polyana, Sochi, Russia on March 31, 2018. (Photo by Artur Lebedev/TASS)

A Goat is displayed on a stage for animal breeders and collectors during a rare levant goat auction and exhibition on April, 27, 2018, in Amman, Jordan. Animal breeders participants came from Kuwait, Saudi Arabia, UAE, Qatar and Palestine to bid on rare goats at the Jrdanian breeder Yahya Abu Jaber near the Jordanian capital. (Photo by Salah Malkawi/Getty Images)

Two hippopotamus are fed with pumpkins at the Hanoi Zoo, in Hanoi, Vietnam, 25 October 2018. The zoo has been the home for more than 800 animals of over 90 different species, including three hippopotamus, since it was built in 1976. (Photo by Luong Thai Linh/EPA/EFE)