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Gamma-Rapho

Meteor Crater, also known as Barringer Crater, was formed roughly 50,000 years ago when an approximately 150-foot meteorite struck the Arizona desert at an estimated 2,600 miles per hour. The collision left a crater approximately 4,000 feet wide.

Mohenjo-Daro was one of two prominent cities of the ancient Indus Valley civilization. The citadel, a center of activity at the city's peak, towers over the ruins today.

This aerial view shows the Okavango Delta in northern Botswana, which floods from May to September, supporting one of the most biodiverse watersheds in southern Africa.

When Edith Friedmann and the other young women arrived at Auschwitz, they didn't know at first that they were prisoners. But Edith wondered why there was barbed wire around the barracks. Shown here in 1990, the death camp complex is preserved as a memorial.

Mountainer Reinhold Messner, right, and colleague inspect the mummified remains of Ötzi the Iceman following his discovery in 1991.

Princess Georgina and Prince Francis Joseph II of Liechtenstein pose with one of their children at Vaduz Castle.

In this official photo, Japan's Emperor Akihito, center left, and Empress Michiko, center right, smile to Prince Hisahito, fifth from right. Also pictured are from left, Crown Princess Masako, Crown Prince Naruhito, Princess Mako, behind Akihito, Princess Aiko, Princess Kako, Prince Akishino, Prince Hisahito and Princess Kiko.

The Mosuo people, who live at the edge of Lugu Lake in China’s Yunnan province, are a semi-matriarchal society of Tibetan Buddhists. Mosuo women inherit property, sow crops, and—as elders—are the final decision-makers in their family. These families are organized around women and their children, rather than two parents and their children, since men and women enter casual “walking marriages” rather than lifelong marriages.

A Greenpeace operation sets out to save bluefin tunas, a species that migrates through much of the high seas.

Smiles developed as a defense mechanism, often employed when one's personal space has been invaded, which makes Mona Lisa's enigmatic expression even more mysterious.