Hundreds of thousands of people are expected to flock to London’s medieval Westminster Hall from Wednesday to pay their respects to Queen Elizabeth II, whose coffin will lie in state for four days until her funeral on Monday.

Here’s a look at what to expect for the occasion, including its traditions, the waiting route and what mourners will see:

HOW LONG WILL THE QUEEN LIE IN STATE?

People who want to view the queen’s coffin can do so 24 hours a day from 5 p.m. local time (1600GMT) Wednesday until 6:30 a.m. on Monday, the day of the state funeral.

WHAT WILL PEOPLE SEE?

The closed coffin is draped with the Royal Standard, a flag representing the sovereign and the U.K. It is adorned with royal regalia including the orb, the sceptre and the bejewelled Imperial State Crown — the same one the queen wore for her 1953 coronation.

The coffin is placed on a catafalque, or a raised platform, in the center of Westminster Hall. Royal guards in plumed hats and ceremonial uniform will stand 24 hours a day at each corner of the platform.

When the coffin was in Scotland earlier this week, it was topped with the Crown of Scotland and a wreath of white flowers.