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Stamp of San Marino (1965, 90 L) showing cave-scene from Dante

The location of hell is traditionally spelean. So I have on one page of - my album the stamp of San Marino (1965, 90 L) showing the River Styx.

From the Cayman Islands comes the Hell postmark. Hell there is a famous region about 1 hectare of barren limestone almost totally covered with jagged limestone pinnacles 0.5 to 1.5 meters high. To me they appear to be phytokarstic. A hamlet with one bar, three small souvenir shops and a new post office is nearby.
 

Postmark Hell Grand from the Cayman Islands