Just to the west of the Palace is the Abbey. In it's shadow is St. Margaret's church. Walk across the street (a daring bit of frivolity) and you are there at Westminster Abbey.
The floor plan sets the tone for a visit. One must see and not step on the Grave of the Unknown Warrior and then all the way to the far back is the Battle of Britain window. Don't forget Poet's Corner.
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An Index of key sights, stops, B&B's, food and general recommendations is provided at INDEX.