‘Halt, who comes there?’
‘The Keys.’
‘Whose keys?’
‘Queen Elizabeth’s Keys.’
‘Pass then, all’s well.’
The above dialogue can be heard daily at around 8 p.m. by those who visit The Ceremony of the Keys at the Tower of London. The event is supervised by the Yeoman Warders.
GR8 to Know
Admission is free but you must book a “ticket” online in advance. Be quick – tickets are usually booked in a year’s advance.
More about The Tower of London here and here