Choosing a castle by fortification and location

If you could own a castle from any period and place it in Britain, which would you choose for a siege?

The preferences vary: a completed Beaumaris on St Michael's Mount combines fortification and island setting, while other choices emphasize moats, high ground, or an established harbour fort.

A hypothetical castle choice becomes a debate about what qualifies as a defensible fortification. Neuschwanstein's mountain setting and gatehouse are set against the objection that it is a nineteenth-century romantic construction. Alex's preference is to complete Beaumaris and place it on the island occupied by St Michael's Mount in Cornwall. Other suggestions bring in Leeds Castle's water defences and Fort St Angelo's position on Malta's Grand Harbour. These choices expose different priorities in the exercise: surviving a siege, using the surrounding terrain, or choosing an admired building.