The grand building you see today at the top of Market Place is actually the fourth town hall of Henley. It was finished in 1901 as a tribute to Queen Victoria's Diamond Jubilee.
The third town hall which stood on the same site was moved to Crazies Hill a village just outside Henley if you go over the bridge and remains today as a private house.
There's a visitor's information centre inside, just walk in and head down the stairs and it's on your left and yes, they sell Henley playing cards!
The wonderfully grand rooms are available to hire including the Main Hall, Council Chambers and Committee Room - all accessed via a marble staircase. You can also get married there too and folk often do, so keep an eye out, especially on Saturdays.