When Did Castles Stop Being Built? The Decline of Castles

There is no single end date for castles—their military role faded gradually from the 15th century onward as gunpowder artillery made high curtain walls vulnerable.

Key Turning Points

• 1453 – Fall of Constantinople; massive cannons proved walls obsolete.
• 15th–16th c. – Trace italienne (star forts) replaced vertical walls with low, thick, angled bastions.
• 17th c. – Vauban's scientific fortification; castles became palaces or ruins.

Continuing Roles

• Royal/Aristocratic Residences – Windsor, Balmoral, Neuschwanstein (19th c. revival).
• Military Garrisons – Edinburgh Castle, Tower of London (active into 20th c.).
• Administrative Centers – Regional courts, prisons, armories.
• Tourism & Heritage – Preserved as monuments (UNESCO, National Trust).

Today, "castle" often denotes a historic building with castellated architecture rather than a fortification. Many remain inhabited or in ceremonial use.