Wembley (1923 & 2007), London, England. The original Wembley, built in 1923 famed for its iconic twin towers, and for being home to the English National team, hosting FA Cup Finals and The 1966 World Cup. Replaced in 2007 with a new stadium, sporting a similarly iconic 134 metre Wembley Arch.
A magnetic field can be formed by passing electric current through a wire, and electromagnets work on this basic principal. Electromagnets are used for creating plenty of appliances ranging from motors, speakers, heads for tape drives, and hard disks; here's a brief insight to electromagnets.
Modern electrometers based on vacuum tube or solid-state technology can be used to make voltage and charge measurements with very low leakage currents, down to 1 femtoampere. A simpler but related instrument, the electroscope, works on similar principles but only indicates the relative magnitudes of voltages or charges.