The rain in Spain stays mainly north of the plain, but the weather in Bilbao is perfect for exploring the unique, ancient culture of the Basque people.
As Herodotus described, three of the greatest engineering feats in the Greek world were achieved in Samos during the 6th century BC: the Mole protecting the port, the Tunnel of Eupalinos (pictured) and the Temple of Hera.
The 14th century city wall of Nanjing is the most complete in China, despite decades of erosion, vandalism and destruction.
Primarily devoted to chariot races, the Circus Maximus in Rome could seat up to 150,000 people back in the day.
