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

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

Suspension footbridge, Wye River in Sellack, Herefordshire, England, United Kingdom