Killiney Hill is the southernmost of the two hills which form the southern boundary of Dublin Bay. Crowned by an obelisk, the hill is 153 metres high and has views over the surrounding areas: Dublin to the northwest; the Irish Sea and the mountains of Wales to the east and southeast; and Bray Head and the Wicklow Mountains to the south. The hill was higher in the past but material was removed from the summit for the construction of the pier at Dún Laoghaire. Killiney Hill stands in the former townland of Mount Mapas, or Scalpwilliam, first mentioned under that name in the beginning of the 17th century. Former residents included Captain Edward Maunsell, who served as the High Sheriff of County Dublin in 1755, followed by Colonel the Hon. Henry Loftus, MP for Bannow in County Wexford. Loftus planted the hill and built nearby roads. In 1790 Lord Clonmell lived here and constructed a park which he filled with deer. Killiney Hill and Dalkey Hill are both part of Killiney Hill Park, a small public park overlooking the villages of Dalkey to the north and Killiney to the west. In 1887 it was dedicated to public use by Prince Albert Victor of Wales, in memory of Queen Victoria's Jubilee, and called Victoria Hill. The park is crossed by a number of walking tracks, and with views in all directions, is used by walkers and hikers from the surrounding areas.
Obilisk Hill halt was located between Dalkey and Ballybrack stations on this scenic section of the Dublin–Rosslare railway line,. The Dublin and Wicklow Railway opened the station one year after constructing their line from Dún Laoghaire to Bray in 1854. The station only had one platform located on the down side of the line, as the line between Dalkey and Killiney was originally built as single track. The station also featured a footbridge, and was accessed from the parallel Vico Road above the railway. A walled pathway also existed on the seaward side, giving access to a small cove. This allowed sea bathers continued access to the shore, which the new railway would otherwise have prevented. Obelisk Hill closed on 1 January 1858 and was replaced by the original Killiney railway station at Strathmore Rd. Today, only one of the footbridge piers at the former station site remain, as does the now crumbling walled pathway on the seaward side. At the southern end of the Obelisk Hill station site is a footbridge over the railway at Whiterock beach, while at the northern end is the southern portal of Dalkey Tunnel. The line between Dalkey and Killiney was eventually doubled in 1882.
