September 2021, day by day.

Slopes of Signal Hill in St. John's Newfoundland and Labrador (© Terrance Klassen/Alamy Stock Photo)

2021-09-01

Porto Flavia, Sardinia, Italy (© Visualframing/Adobe Stock)

2021-09-01

The 'Alien Egg Hatchery' in the Bisti/De-Na-Zin Wilderness, New Mexico (© Ian Shive/Tandem Stills + Motion)

2021-09-02

Houseboats in the backwaters in Alappuzha, Kerala, India (© Martin Harvey/The Image Bank/Getty Images)

2021-09-03

Anna's hummingbird (© Dee/Getty Images)

2021-09-04

The Regata Storica on the Grand Canal in Venice, Italy (© Alexander Duffner/Alamy)

2021-09-04

Howgill Fells in the Yorkshire Dales National Park, England (© davidnmoorhouse/iStock/Getty Images Plus)

2021-09-05

Decorative ceiling of the rotunda in the British Columbia legislative building, Victoria, B.C. (© Roy Langstaff/agefotostock)

2021-09-06

Park service employees inspecting Mount Rushmore National Memorial, South Dakota (© Universal Images Group via Getty Images)

2021-09-06

Humpback whales off the coast of Massachusetts (© Eric Kulin/plainpicture)

2021-09-06

Livraria Lello in Porto, Portugal (© Nido Huebl/Shutterstock)

2021-09-07

Riou island, Calanques National Park, France (© Jason Langley/AWL Images/Offset by Shutterstock)

2021-09-08

San Juan Islands, Washington (© Stephen Matera/Tandem Stills + Motion)

2021-09-08

Panchamukhi Ganesh statue (© Tomexx/iStock/Getty Images Plus)

2021-09-09

River Avon in Bath, England (© Robert Harding World Imagery/Offset by Shutterstock)

2021-09-10

Benagil Cave in the Algarve, Portugal (© Michael Malorny/Offset by Shutterstock)

2021-09-10

The Toronto skyline viewed from the Toronto Islands (© AWL Images/DanitaDelimont.com)

2021-09-11

US flag on part of a 9/11 memorial overlooking the New York skyline from Exchange Place, Jersey City, New Jersey (© Gary Hershorn/Getty Images)

2021-09-11

Hainich National Park, Thuringia, Germany (© mauritius images GmbH/Alamy)

2021-09-11

Asian elephants in West Bengal, India (© Avijan Saha/Minden Pictures)

2021-09-11

Birnbeck Pier on the Bristol Channel in Weston-super-Mare, England (© Stephen Davies/Adobe Stock)

2021-09-12

Aerial view of the Venice Skatepark in Venice Beach, Los Angeles (© Ingus Kruklitis/Getty Images)

2021-09-12

Aldeyjarfoss waterfall in northern Iceland's interior landscape (© Jim Patterson/Tandem Stills + Motion)

2021-09-13

The exterior wall of Maison du Festival in Quartier des Spectacles, Montreal (© Hemis/Alamy Stock Photo)

2021-09-15

Artist Jesus 'CIMI' Alvarado painting his mural 'Fronterizos' on a wall of the El Paso Museum of Art, El Paso, Texas (© Paul Ratje/AFP via Getty Images)

2021-09-15

Palacio de Bellas Artes, Mexico City (© Lukas Bischoff Photograph/Shutterstock)

2021-09-15

The monuments of Orchha in Madhya Pradesh, India (© Kevin Standage/Shutterstock)

2021-09-16

Red panda at the Chengdu Panda Base in Sichuan province, China (© Biosphoto/Alamy)

2021-09-17

Roe deer buck, Schleswig-Holstein, Germany (© Helge Schulz/Minden Pictures)

2021-09-18

Le Castella at Capo Rizzuto, Italy (© mRGB/Shutterstock)

2021-09-18

Land's End, Cornwall, England (© Andrew Turner/Getty Images)

2021-09-19

Starlings during the autumn migration in the wetlands between Denmark and Germany (© Viking/Alamy)

2021-09-19

'Rising Moon' lantern to celebrate the Mid-Autumn Festival in Hong Kong's Victoria Park (© Bobby Yip/Reuters)

2021-09-20

Willow trees, Lake Bret, Bugey, France (© Jean-Philippe Delobelle/Minden Pictures)

2021-09-21

Baby white rhinoceros and mother in Hluhluwe–Imfolozi Park, South Africa (© Martin Harvey/Alamy)

2021-09-21

Neptune (© NASA/JPL)

2021-09-22

Cusco Cathedral on the Plaza de Armas, Cusco, Peru (© sharptoyou/Shutterstock)

2021-09-23

Sahyadri mountain range during the monsoon season in India (© Bhushan Patil Photography/Moment Open Collection/Getty Images)

2021-09-24

Escarpment Trail in Porcupine Mountains Wilderness State Park, Michigan (© Pat & Chuck Blackley/Alamy)

2021-09-25

The Mackenzie River in Canada emptying into the Beaufort Sea (© Norman Kuring, GSFC/NASA/USGS Landsat)

2021-09-25

Thorn bug, Pico Bonito National Park, Honduras (© Mac Stone/Tandem Stills + Motion)

2021-09-26

Mount Fuji in Japan (© The Asahi Shimbun/Getty Images)

2021-09-27

The Broads National Park, Thurne, Norfolk, England (© Steven Docwra/Getty Images)

2021-09-28

A wood bison near Behchoko, in the Northwest Territories, Canada (© Don Johnston/agefotostock)

2021-09-28

Container ship in San Pedro, California (© Cameron Venti/Getty Images)

2021-09-29

Hyacinth macaws in the Pantanal region of Brazil (© David Pattyn/Minden Pictures)

2021-09-30