London's Tower Bridge celebrates its 120th birthday this year by unveiling 1 million Pounds glass walkway 140ft above River Thames, costing just 9 Pounds to visit. The installation of the walkway took a 20-strong team more than six weeks to construct. The original steel lattice structure has been preserved under the glass.
1. Famous Londons Tower Bridge Unveils Glass Walkway 140ft Above River Thames 5.0