No roof, but a fine floor

Delos, Greece "has been inhabited since the 3rd millennium BC. . . . By the time of the Odyssey the island was already famous as the birthplace of the twin gods Apollo and Artemis. . . . Indeed between 900 BC and AD 100, sacred Delos was a major cult centre, where Dionysus is also in evidence as well as the Titaness Leto, mother of the above mentioned twin deities. Eventually acquiring Panhellenic religious significance, Delos was initially a religious pilgrimage for the Ionians.

A number of "purifications" were executed by the city-state of Athens in an attempt to render the island fit for the proper worship of the gods. The first took place in the 6th century BC, directed by the tyrant Pisistratus who ordered that all graves within sight of the temple be dug up and the bodies moved to another nearby island. In the 5th century . . . under instruction from the Delphic Oracle, the entire island was purged of all dead bodies. It was then ordered that no one should be allowed to either die or give birth on the island due to its sacred importance and to preserve its neutrality in commerce. . . ."

en.wikipedia.org/wiki/Delos

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