Tomorrow's tourists may have to take Australia's Great Barrier Reef and Croatia's Dalmatian Coastline off their destination wish list.

Climate change and tourism damage mean that, like the Seven Wonders of the World, certain sites and attractions could be in danger of disappearing by 2020.

The Future of Travel Report^*, by travel insurer Churchill, assesses the future prospects of today's travel destinations. It reveals that World Heritage sites and other tourist destinations popular today, may be permanently closed or restricted by visitor capping or will remain at risk of irreparable damage.

Areas of environmental and historical significance such as the Great Barrier Reef, the Everglades or Kathmandu Valley, are likely to have reached visitor capacity by 2020.

Such destinations may opt to minimise visitor numbers by continually raising entry costs or by charging additional taxes. It is likely that some destinations will go as far as to introduce visitor capping where travellers will either have to ‘win' or ‘earn' the right to holiday in a particular place via a holiday lottery.

Some tourist areas, particularly those which involve long haul flights from the UK, may require travellers to store up ‘air mile credits' based on their personal needs and their overall energy use. Additionally, the social contributions that travellers put back into the communities they visit, may be considered before being granted visitation rights to a particular destination.

The report, issued in conjunction with think tank The Centre for Future Studies, reveals the top ten places that are at risk as holiday destinations by 2020:

(^*The Report into the Future of Travel was prepared on behalf of Churchill Travel Insurance by The Centre for Future Studies)