as West Pennant Hills, located in the Hills District. However, when the northern railway line was built it passed through what is now Pennant Hills, so a suburb grew around the station and took on the name. The area around Thompsons Corner was renamed West Pennant Hills. Pennant Hills is hilly and the highest altitude is at Observatory Park on Pennant Hills Road, which once was the site of the old astronomical observatory. During the 1960s and 1970s, Pennant Hills was the site of Chelmsford Private Hospital, where the unorthodox psychiatric Deep Sleep Therapy conducted by Dr Harry Bailey resulted in the deaths of dozens of patients. Commercial areas Pennant Hills is one of the major commercial centres of Hornsby Shire. Several dozen shops are located at the north-west of the railway line, along with the local Pennant Hills Library. Several restaurants and cafes are located around Yarrara Road. Pennant Hills Marketplace, a local shopping centre, is located along Hillcrest Road. Residential houses are found in all areas in Pennant Hills, with recent modern apartments and office towers found along Pennant Hills Road. A significant commercial/industrial area can be found along Pennant Hills Road. Pennant Hills is home to several entertainment venues including the Pennant Hills Hotel. Transport Pennant Hills railway station is on the Northern Line of the Sydney Trains network. Pennant Hills Road is one of Sydney's major thoroughfares. Bus services by Transdev NSW and Hillsbus have their terminus in Pennant Hills and run to West Pennant Hills, Castle Hill and Cherrybrook. Churches Pennant Hills was established as a Catholic parish in 1928 and a number of Catholic churches have been built since then. The parish's current church, St. Agatha's, was built in 1979. St Mark's Anglican Church, Pennant Hills Baptist Church Pennant Hills Uniting Church Thornleigh Seventh-day Adventist Church is located in Pennant Hills. Pennant Hills is also home to the first Danish Church in Australia. Crown Prince Frederik and Crown Princess Mary of Denmark made an official visit there on 6 March 2005. Schools Pennant Hills has two public schools: Pennant Hills Public School established in 1925 and Pennant Hills High School established in 1966, and two Catholic schools, Mount St Benedict College a girls secondary school and St. Agatha's Catholic Primary School. Sport and recreation Parks and reserves Pennant Hills is surrounded on two sides by large swathes of bushland. To the east, the suburb