A castle is usually a fortified residence or seat of power. A fortress is built primarily for defence and may have little domestic character. A palace is a prestigious residence or state building whose authority comes from ceremony and scale rather than fortification. A manor house is the principal residence of a landed estate. These are working definitions, not perfect boxes.
What to look for
- Defensive walls, controlled gateways and fighting positions suggest a castle or fortress.
- Large reception suites, formal approaches and ceremonial rooms point toward a palace.
- Farm buildings, estate offices and a relationship to surrounding agricultural land support the manor-house label.
- An official residence may belong to any architectural type; its title describes use, not construction.
How the idea developed
Meanings changed with language, region and period. A medieval fortified residence could later be remodelled as a comfortable house. A palace might occupy an older fortress. Nineteenth-century revival buildings sometimes borrowed towers and battlements without ever serving a defensive role.
Why the distinction matters
Clear labels help readers understand what a building was designed to do. They also prevent a romantic name—such as “castle” on a hotel or mansion—from being mistaken for evidence of medieval military use.
Examples and edge cases
- Windsor combines fortress, royal residence and ceremonial workplace.
- The White House is an official residence and executive workplace, not a castle or traditional royal palace.
- Casa Loma is commonly called a castle, but it began as an early twentieth-century private mansion.
Questions to ask when reading a site
- What was the building’s original purpose?
- Could its defences withstand attack, or are they decorative?
- What surrounding estate, town or military landscape supported it?