Firstly, if your wine collection is of substantial size, it's almost certainly worth insuring it separately from your house insurance.
This is assuming that your collection consists of hundreds of bottles, with many worth close to $100, or perhaps a lot more.
General House insurance will almost certainly undervalue a wine collection, particularly in the case of a serious fire or similar.
Rather, you should work out a combination of blanket and itemised insurance which will cover the pieces completely for the best value.
Blanket insurance can cover your entire cellar - you should look to that first, unless you're insuring just a handful of extremely high-end bottles.
Blanket insurance will usually cover individual bottles up to many thousands of dollars per item.
Nevertheless, if you do have bottles, such as ones from Domaine de la Romanée-Conti which are worth several thousand, the best cover for the best value can be provided by insuring them separately.
When choosing your insurance, it is important to think about all the potential risks to a wine cellar.
Although fires, floods and thefts are among the most obvious threats, some other occurances, which to the average homeowner would be a minor annoyance, can be catastrophic for your wine cellar.
A malfunctioning thermostat, for example, could ruin your collection, but this would never be covered in a general dwelling insurance policy.
Any possibility of the cellar changing its temperature, becoming exposed to sunlight, or of becoming so dry that the corks let air in, should be written into your insurance.
Also bear in mind, especially if you are a new or inexperienced collector, that the storage of fine wines is often, and generally, best left to the professionals.
Professional storage facilities are available (typically charged at a flat fee of £5.00 to £7.50 per case per year). Wine held in this way is kept under bond, with no duty or VAT to pay on it until it is withdrawn.
Otherwise, bear the above in mind, and hopefully your wine can sit safely and appreciate in value for many years to come.