Eiffel Tower In 1909, a permanent underground radio centre was built near the south pillar, which still exists today. On 20 November 1913, the Paris Observatory, using the Eiffel Tower as an aerial, exchanged wireless signals with the United States Naval Observatory, which used an aerial in Arlington, Virginia. The object of the transmissions was to measure the difference in longitude between Paris and Washington, D.C. Today, radio and digital television signals are transmitted from the Eiffel Tower. A television antenna was first installed on the tower in 1957, increasing its height by 18.7 m (61.4 ft). Work carried out in 2000
Observation tower is a support pillar of the aerial tramway in Barcelona. It is equipped with an observation deck. The Blackpool Tower (still standing) and the New Brighton Tower (demolished) resembled smaller versions of the Eiffel Tower, while Watkin's Tower at Wembley, if completed, would have been taller than the Eiffel Tower. The i360 in Brighton is a 162-metre (531 ft) observation tower and the world’s first vertical cable car. Enger Tower, Reunion Tower, Seattle's Space Needle, Gatlinburg, Tennessee's Space Needle and the Tower of the Americas are some examples of observation towers in the United States. Joachim Kleinmanns: Schau ins Land.