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

Brilliant red Forth Bridge railway crossing, UNESCO World Heritage Site, at the Fírth of Forth in South Queensferry, near Edinburgh, Scotland, United Kingdom, Europe

Forth Rail Bridge, built between 1883 and 1890, an achievement of Victorian engineering, Fife, West Lothian, Scotland, United Kingdom, Europe

Detail of Burj Khalifa, world's tallest tower, Downtown Burj Dubai, Dubai,United Arab Emirates

Corinth Canal connecting the Gulf of Corinth in the Ionian Sea with the Saronic Gulf in the Aegean Sea, Greece