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
Petřín Lookout Tower Petřín Lookout Tower The Petřín Lookout Tower (Czech: "Petřínská rozhledna") is a 63.5-metre-tall steel-framework tower in Prague, which strongly resembles the Eiffel Tower. The Petřínská rozhledna was built in 1891 and was used as an observation tower as well as a transmission tower. Today the Petřínská rozhledna is a major tourist attraction. The hill is roughly a half-hour walk up paths (which gets quite slippery in the snow) and the tower is a shorter but fairly tiring climb; however, the hill is served by a frequent funicular and the tower has an elevator for disabled people. In 2014 the tower