The Lascaux Cave contains 17,300-year-old pre-historic paintings and is closed to the public since 1963 to protect the art from human damage.
Lascaux Caves, France
Home to the Sentinelese tribe for over 50,000 years, this island is strictly prohibited for visitors due to the tribe's violent defense of their isolation.
North Sentinel Island, India
Formed from a volcanic eruption, Surtsey is the newest island and is only accessible to scientists to prevent disruption of its ecological succession.
Surtsey Island, Iceland
This important Shinto shrine is rebuilt every 20 years and is off-limits to all except the Japanese royal family.
Ise Grand Shrine, Japan
Once a quarantine hospital and rehab center, this now bird sanctuary in New York City is closed to the public.
North Brother Island, USA
Located in New Mexico, this highly secure underground lab is rumored to house advanced technologies and human-animal hybrids.
Dulce Base, USA
This barren island with active volcanoes is restricted by the Australian Government to protect its fragile environment.
Heard Island, Australia