Stonehenge

Stonehenge was an assemblage of giant stones erected in Wiltshire during the 2nd Millennium BC.

Creation
The Doctor and Samantha Jones visited Stonehenge while it was being constructed. (ST: The People's Temple) The Monk, however, claimed to have used anti-gravity lifts to assist in the completion of Stonehenge circa 1500 BC. (DW: The Time Meddler)

Modern times
During the 1970s, the Ragman was defeated at Stonehenge. (PDA: Rags) In 1976, UNIT fought Vardans at Stonehenge, where the Doctor was captured by the Monk. (NA: No Future)

Circa 2005, when Canisian General Tannis invaded Earth circa 2005, he had his fleet land near Stonehenge. (WC: Death Comes to Time)

Other information

 * Stonehenge was near the location of an opening to the Yssgaroth's Universe. (NA: The Pit)
 * Stonehenge will be featured in the Series 5 when the the Doctor, Amy Pond and River Song run across the area, as seen in the preview trailer. (DW:The Pandorica Opens/The Big Bang)