On your next trip to London, visit the City Hall building, which is often compared to a motorcycle helmet, distorted egg or Darth Vader’s helmet. Headquarters of the Greater London Authority comprising the Mayor’s office and Assembly chamber since 2002, the unusual bulbous-shaped, steel and glass structure is intended to promote efficient energy use. From the 1,640-foot spiral walkway ascending the height of the structure, you can view the building interior, which is meant to symbolize transparency in government operations. The public is not permitted on the ramp during the monthly meetings of the Councilors. London’s Living Room, an exhibition and meeting space, sits atop City Hall and offers a viewing deck that is open to the public periodically. Check out tour opportunities during the annual September open-house weekend.