Switzerland - Inaugurated in 2016, Gotthard Base Tunnel is the world's longest railway tunnel. The lines arrow through the Swiss Alps and boast a route length of 57 km (35 mi).
The Brunkeberg tunnel is one of the most photogenic spots in Stockholm. It is 231 m (758 ft) long and was built from 1884 to 1886 for pedestrians and cyclists.
England - Opened in 1904, the Greenwich foot tunnel crosses beneath the River Thames and links the London borough of Greenwich with the city's Docklands district.
Philippines - A 55-m (180-ft) 200-degree curved walkway tunnel is the highlight of the Manila Ocean Park, which affords visitors amazing sea-life views.
This is one of the oldest tunnels in the world! Built on the orders of the Roman emperor Vespasian, it facilitates passage on the ancient Roman road Via Flaminia, which snakes through the Furlo Pass.
England - The Channel Tunnel, also referred to as the Euro Tunnel, is the only fixed link between the island of Great Britain and the European mainland. Opened in 1994, the rail tunnel is 50 km (31 mi) long.
China - The Andong Tunnel, constructed by the Chinese People's Liberation Army in the 1970s, is now part of the Matsu National Scenic Area and open to the public.
