There is a good accidental re-discovery story about the Roman Basilica Cistern, also known as Yerebatan Sarayı or "Sunken Palace" (http://en.wikipedia.org/wiki/Basilica_Cistern) under the Turkish city of Istanbul (Ottoman Constantinople). It has fish in it and the people living above it had holes in the floor of their cellars where they would lower a bucket into the water and pull up the occasional fish. Doesn't seem that anyone wondered what was down there - too superstitious I suppsoe.
It wasn't till more recently when the local police station was being rebuilt (and lower floors dug out for whatever purpose) that they broke through into the lost cistern. A tourist visit now - but there are others still to discover I'm sure.
It wasn't till more recently when the local police station was being rebuilt (and lower floors dug out for whatever purpose) that they broke through into the lost cistern. A tourist visit now - but there are others still to discover I'm sure.