Barragem do Alqueva, Rio Guadiana river, Alqueva dam hydroelectric power, Moura, Portugal, Europe

Wynyard Quarter bridge, Auckland, North Island, New Zealand

Interior view of the Johnson Canyon Railroad Tunnel, Kaibab National Forest of Arizona, USA

The iconic Golden Gate Bridge, San Francisco, California, United States of America, North America

Petronas Twin Towers at night, the most famous twin skyscrapers in Kuala Lumpur, Malaysia

Close-up view of the columns of The Parthenon against a blue, cloudy sky with a sunburst at twilight on the Acropolis of Athens, an ancient citadel located on a rocky outcrop above the City of Athens, Athens, Greece