Terra Indigena Xinane Isolados, Brazil
The Brazilian government has allocated 1,750 square kilometers of terrain for uncontacted indigenous people along the border between Brazil and Bolivia. This region is located on the Brazilian side of the border. The general public is not permitted to enter this area under any circumstances.

Terra Indigena Xinane Isolados Brazil
Alnwick Poison Garden, England
Something a bit more sinister may be found tucked away inside of the lovely English Alnwick Garden. It is a little garden that is full of plants that are capable of killing you. The restrictions are quite stringent. Therefore you are not permitted to enter the garden unless you are accompanied by a tour guide who has received extensive training. (During the course of only one summer, seven individuals passed out as a result of breathing an excessive amount of the hazardous vapors while on excursions.)

Alnwick Poison Garden England