Grade I Listed Buildings are structures in the United Kingdom recognized for their exceptional architectural and historical significance. Only about 2.5% of all listed buildings fall into this category, highlighting their importance in the nation's heritage. These buildings are protected by law, ensuring that any alterations or demolitions are carefully controlled to preserve their unique character. To be designated as Grade I, a building must meet specific criteria, including age, design, and historical interest. Examples of Grade I Listed Buildings include famous landmarks like Westminster Abbey and St. Paul's Cathedral, which showcase outstanding craftsmanship and cultural value.