Its location was held secret by the Incas

Held secret from the Allies

Castelcivita Caves were probably used as a hiding place for Spartacus' rebels army.

Some Cherokees hid in the park area escaping a forced deportation by American authorities.

The Hospital Cave on Cat Ba was used as a secret hospital during the Vietnam War

Numerous underground passages were probably used as shelter during battles.

During the XVIII and XIX Centuries, some peripheral places were used as shelter sites ("palenques") by runaway slaves. (EOEarth)

Several cave dwellings were found on the island. They were hidden by rock walls and were probably used as shelters during war times.

Early Christian sects fleeing persecution found refuge in the Kadisha. Among these groups were the Jacobites (Syrian Orthodox), Melchites (Greek Orthodox), Nestorians, Armenians, and even Ethiopians. The Maronites, however, are the dominant Christian group in the valley.

Hiding places for escaped slaves

the remaining Japanese Catholics could only continue their faith by themselves in secret (AB ev)

Eagle's Reach Cave - "The location of Eagles Reach is being withheld to avoid it being damaged."

Nanny Town Cultural Heritage Route .. secret trails, settlements and natural resources

Secret church, Anne Frank House