Monument, Chinchorro Mummies, UNESCO World Heritage Site, Camarones Valley, northern Atacama desert, Chile, South America

Scorpio Stairway and behind the Brihat Samrat Yantra Pisces astrological sign at The Observatory in Jaipur, Rajasthan, India

Scorpio Stairway and behind the Brihat Samrat Yantra Pisces astrological sign at The Observatory in Jaipur, Rajasthan, India

The Nadivalaya Yantra equatorial instrument at Jantar Mantar, The Observatory in Jaipur, Rajasthan, Northern India

The Nadivalaya Yantra equatorial instrument at Jantar Mantar, The Observatory in Jaipur, Rajasthan, Northern India

Observation deck of The Giant Sundial, Samrat Yantra, The Supreme Instrument, at The Observatory in Jaipur, Rajasthan, India

The Observatory in Jaipur, Rajasthan, India

Scorpio Stairway and behind the Brihat Samrat Yantra Pisces astrological sign at The Observatory in Jaipur, Rajasthan, India

The Observatory in Jaipur, Rajasthan, India

Observation deck of The Giant Sundial, Samrat Yantra, The Supreme Instrument, at The Observatory in Jaipur, Rajasthan, India

Observation deck of The Giant Sundial, Samrat Yantra, The Supreme Instrument, at The Observatory in Jaipur, Rajasthan, India

Students on a visit to The Observatory walk around the stone instruments in Jaipur, Rajasthan, Northern India

Melt water on the Greenland ice sheet which is melting at an unprecedented rate due to human-induced climate change, near Camp Victor north of Ilulissat, Greenland, Polar Regions

Melt water on the Greenland ice sheet near camp Victor north of Ilulissat, Greenland, Polar Regions

Marble main entrance of Academy of Athens, national research center, columns or pillars with Athena, ancient Greek goddess and patron of city, and Apollo, ancient Greek god and patron of arts and science. National Greek flag. Summer day, blue sky

Curved rows of seats, theatre, Roman ruins, Leptis Magna, Libya

Curved rows of seats, theatre, Roman ruins, Leptis Magna, Libya

Curved rows of seats, theatre, Roman ruins, Leptis Magna, Libya

Curved rows of seats, theatre, Roman ruins, Leptis Magna, Libya

Overhead view compass world map

Curved rows of seats, theatre, Roman ruins, Leptis Magna, Libya

Curved rows of seats, theatre, Roman ruins, Leptis Magna, Libya

Curved rows of seats, theatre, Roman ruins, Leptis Magna, Libya

Roman ruins, Leptis Magna, Libya

Amphitheatre, Roman ruins, Leptis Magna, Libya

Ancient theatre, Roman Ruins, Leptis Magna, Libya

Plain of Jars, Central Laos - February 2003: A dramatic sunset forms a dramatic backdrop behind the mysterious Plain of Jars in central Laos. The stone jars are still an enigma for archeologists, who have dated the relics to the period between 500 BC and 800 AD. There are many theories as to what the jars were used for and how they were created, but none of the theories are considered definitive.

Hohokam petroglyph in the Saguaro National Monument, Arizona,

A land iguana gives the camera a sideways glance on South Plaza Island in the Galapagos.

Roman Road At Puerto Del Pico, Near Mombeltran; Sierra De Gredos, Avila Province, Spain

Roman Road At Puerto Del Pico, Near Mombeltran; Sierra De Gredos, Avila Province, Spain

Ancient printed diagram of sphere of Ptolemy

Ancient map showing phases of Moon with photos of Moon superimposed

Volvelle from ancient manuscript, Library in monastery, Valldemossa, Mallorca, Spain

Library in monastery, Ancient manuscript, Valencia, Spain

Moorish man wearing a blue draa (traditionnal clothe) near the mosque of Chinguetti. Ancient ksour of Ouadane, Chinguetti, Tichitt and Oualata. Adrar. Mauritania

City and oasis of Chinguetti almost under the sand of the desert. Dunes of the Adrar desert near Chinguetti. Ancient ksour of Ouadane, Chinguetti, Tichitt and Oualata. Adrar. Mauritania

City and oasis of Chinguetti almost under the sand of the desert. Dunes of the Adrar desert near Chinguetti. Ancient ksour of Ouadane, Chinguetti, Tichitt and Oualata. Adrar. Mauritania