The World Heritage Site, one of only two in Scotland to make the top ten, was squeezed out of first place by Ironbridge Gorge, in Shropshire.
In early December, 1999, it was confirmed that the Heart of Neolithic Orkney had been added to the list of UNESCO World Heritage Sites.
The designation not only includes the area’s major sites — monuments such as Maeshowe, the Ring of Brodgar and the Stones of Stenness — but also other sites in the area, including the Watch Stone, the Barnhouse Stone and the Barnhouse Settlement.
According to TripAdvisor, the top ten is based on more than 1.1 million traveller feedback forms, collected in partnership with UNESCO, making this the largest study of its kind ever conducted.
TripAdvisor spokesperson Emma Shaw said: “Every one of the 962 designated UNESCO World Heritage Sites is of enormous cultural or natural significance.
“These lists identify the sites that are valued most highly by the millions of TripAdvisor travellers who visit them, and therefore the Heart of Neolithic Orkney should be incredibly proud of its position at second place.”
The partnership between TripAdvisor and UNESCO’s World Heritage Centre was launched in October 2009 to raise awareness of and gain travellers’ support to preserve natural and cultural sites inscribed on UNESCO’s World Heritage list.
Within the partnership, TripAdvisor is also providing support to the World Heritage Centre to help monitor the conservation of the world’s most important cultural and natural heritage sites.