Second Severn Crossing

A view of the Second Severn Crossing, as seen from Severn Beach, England. This bridge carries the M4 motorway across the River Severn between Severn Beach and Caldicot in south Wales. It has a total span of 5.1 km and includes a cable-stayed section called the Shoots Bridge which spans the shipping channel between the two towers. The River Severn has a vast tidal range—the point from which this photograph was taken is covered at high tide.

Tower Bridge, Sacramento, California, USA

An HDR image of Tower Bridge at twilight crossing the Sacramento River in Sacramento, California. Completed in 1935, this was the first vertical lift bridge in the California Highway System. It is 52 feet (15.8 m) wide, 737 feet (223.3 m) long, and 160 feet (48.5 m) tall. There are four lanes for cars, and one large center lane for a railroad.

Porto, Portugal

Panoramic photo of the historical part of the city of Porto, Portugal, and the Douro river. Historic references to Portugal's second city date back to the 4th century, although Celtic and pre-Celtic remnants of ancient citadels were found in the heart of where Porto now lies.

Lower Manhattan skyline

Lower Manhattan (seen here from the Staten Island Ferry) is the southernmost part of the island of Manhattan, the main island and center of business and government of the City of New York. Lower Manhattan includes City Hall, the Municipal Building, the Financial District and the site of the World Trade Center. This area is also the earliest settled (by Europeans) area, and is one of the few areas of Manhattan that does not have its streets arranged in a strict grid pattern.

Tower Bridge, London

The Tower Bridge is a bascule bridge that crosses the River Thames in London, England. It was completed in 1894 and the original hydraulic machinery still opens the bridge, although it has been modernised. The central span of 200 feet (61 m) between the towers is split into two equal bascules or leaves, which can be raised to an angle of 83 degrees to allow river traffic to pass. The high-level walkways between the towers houses an exhibition on the bridge's history.

Melbourne's Yarra River at twilight

Melbourne's Yarra River at twilight

Melbourne is the state capital and largest city in the Australian state of Victoria, and the second largest city in Australia (after Sydney), with a population of approximately 3.8 million. The central business district (the original city) is laid out in the famous mile-by-half-a-mile Hoddle Grid, its southern edge fronting on to the Yarra River.

Night view of the Yarra River

Night view of the Yarra River as it flows through the centre of Melbourne, with the central business district on the left and Southbank on the right. The river's source is a series of swamps in the upper reaches of the Yarra Ranges National Park, and travels 242 kilometres through southern Victoria before entering Melbourne's suburbs at Chirnside Park.

The Sydney Harbour Bridge

The Sydney Harbour Bridge is one of the major landmarks of Sydney, Australia, connecting the Sydney central business district with the North Shore commercial and residential areas, both of which are located on Sydney Harbour. The dramatic water vista of the bridge together with the nearby Sydney Opera House (left) is an iconic image. The bridge is affectionately known as "the Coathanger" by many Sydneysiders on account of its arch-based design.

The Golden Gate Bridge

The Golden Gate Bridge is a suspension bridge spanning the Golden Gate, the opening into the San Francisco Bay from the Pacific Ocean. The entire bridge including the approach spans is 1.7 miles (2727 m) long, whilst the main span between the towers is 4200 feet (1280 m). The two towers rise 746 feet (230 m) above the water. From its completion in 1937, the center span was the longest among suspension bridges until 1964 when the Verrazano Narrows Bridge was erected.

Golden Gate Bridge at Night

Did anyone notice the romancing couple in the background.