The cellar here is not usually open to visitors or even to volunteers.
You may consider a cellar to be a basement or semi-basement or a cell and/or a place to store sellers of dangerous products, at least until the relevant authorities can take such persons to a cell elsewhere.
A cellar is often an underground storeroom. You may have a wine cellar or a root cellar or a salt cellar, though the latter has a different etymology to the others.
You may have a storm cellar. You may have been in the middle of a storm cell.
A cellar may be used as a pantry or larder.
The word cella means small room, chamber or compartment in Latin. It could be a granary or barn. It was also the name for the part of the Roman temple where the altar was situated. A Roman cella was therefore not usually underground.
You may or may not have had personal experience of monastic cells and/or prison cells.
You may or may not have had personal experience of underground living.
You may know something about biological cells.
You may know something about electrochemical cells and solar cells.
You may know about cellular structures for the management of organisations.
Do you usually associate a cellar door with a beautiful sound?
Do you associate half-cellars and/or earth-sheltered houses with Hobbits?
Are you familiar with the euphonious aspects of this part of the Internet?
Perhaps you use a cellar as a music recording studio and/or rehearsal space.
Do you ever think much about the symbolism of sounds or are you more interested in the sound of cymbals in a cellar?
The route to the cellar under Frugality Cottage leads through an extraordinarily beautiful door, at least for anyone with the ability to see it, and possibly even hear it.