Dr Stone, who worked in the tourism industry before becoming an academic, says that there is a long history of dark tourism.

BBC: 'Dark tourism' study centre launched by university

Conservationists hope that this system will let them gather data on animal behavior that could prove to be useful for academic purposes as well as boosting tourism activities.

CNN: Drone ranger: Unmanned plane to spy on rhino poachers

U.S. citizens are not allowed to travel to Cuba for mere tourism, though they can obtain licenses for academic, religious, journalistic or cultural exchange trips.

NPR: Treasury: Beyonce, Jay-Z Cuba Trip Licensed

Washington's 51-year embargo makes it illegal for U.S. citizens to visit Cuba for mere tourism, although tens of thousands of Americans travel here each year on academic, religious, journalistic or cultural exchange licenses.

NPR: Beyonce, Jay-Z Turn Heads In Havana

Ms Gere, an academic who specialises in the history of science, deftly mixes archaeology with cultural interpretation and practical tourism (she includes a guide to the site at Mycenae), in a way that is sure to enlighten the perplexed visitor.

ECONOMIST: Ancient Greece