https://en.wikipedia.org/wiki/Pine_Gap
http://www.news.com.au/technology/innovation/pine-gap-spy-base-alice-springs-what-you-never-knew-about-topsecret-facility/news-story/b684b7e9ea355860379e50498f236486

North Sentinel Island
https://en.wikipedia.org/wiki/Andaman_Islands
https://en.wikipedia.org/wiki/Sentinelese
https://en.wikipedia.org/wiki/North_Sentinel_Island

Area 51
https://en.wikipedia.org/wiki/Area_51
https://www.popularmechanics.com/military/research/a24152/area-51-history/

Surtsey Island
http://icelandmag.is/article/a-visit-surtsey-visitor-centre-allows-you-travel-back-time
https://en.wikipedia.org/wiki/Surtsey

Snake Island
https://en.wikipedia.org/wiki/Ilha_da_Queimada_Grande
https://www.atlasobscura.com/places/snake-island-ilha-de-queimada-grande

The Church of OUr Lady Mary of Zion
https://en.wikipedia.org/wiki/Church_of_Our_Lady_Mary_of_Zion
https://www.smithsonianmag.com/travel/keepers-of-the-lost-ark-179998820/

Korean Demilitarized Zone
https://en.wikipedia.org/wiki/Korean_Demilitarized_Zone#Villages
https://www.independent.co.uk/travel/asia/korea-dmz-north-south-border-visit-tours-kim-jong-un-panmunjom-seoul-a8325081.html

Fukushima Exclusion Zone
https://www.theguardian.com/environment/2018/mar/16/is-fukushima-doomed-to-become-a-dumping-ground-for-toxic-waste
https://en.wikipedia.org/wiki/Fukushima_Daiichi_nuclear_disaster

Svalbard Global Seed Vault
https://en.wikipedia.org/wiki/Svalbard_Global_Seed_Vault

Metro 2
https://en.wikipedia.org/wiki/Metro-2#Confirmed_information
https://www.atlasobscura.com/articles/subterranean-secrets-moscow-s-metro-2-and-the-diy-subway-system

The Tomb of Qin Shi Huang
http://www.ancient-origins.net/ancient-places-asia/secret-tomb-first-chinese-emperor-remains-unopened-treasure-002568
https://en.wikipedia.org/wiki/Mausoleum_of_the_First_Qin_Emperor#Archaeological_studies