○○○Bath⪢⪢
Examples of hypocaust systems have been found all over former Roman territories but the best preserved examples are in Bath, England.
http://qindex.info/i.php?x=11835
○○○sandwich bag⪢⪢
You can also preserve food in a sandwich bag. One very popular brand of sandwich bags is called Ziplock so some people call these Ziplock bags.
http://qindex.info/i.php?x=17738