Here's something a bit different, the next time you find yourself with a spare ten minutes on the 23rd of the month -- because it always happens on the 23rd.
Crossbones was an old burial ground that dates all the way back to medieval times. It was situated near the old Clink Prison, in the lawless part of London outside the city limits. This was where they had all the brothels and theatres (like Shakespeare's Globe). These days you'll find places like Southwark Cathedral, The Shard and Borough Market.
15,000 paupers are believed to have been buried here until its final closure in 1853. When the site was rediscovered in the 1990s it began to attract a monthly gathering of people who would come to honour these outcasts of society.
On any normal day all you'll see is a big rusty gate tied with hundreds of ribbons, flowers, feathers and bits of jewellery. But if you pop by at 7 PM on the 23rd of the month then you'll see a big gathering of people swapping stories, singing songs and reciting poems.
The vigil is secular and open to all faiths, but if you'd like to take part then it will be appreciated if you bring a flower, a ribbon, or some other kind of memento to tie to the shrine.
Guided tour of Wren’s best churches – Every Tue and Thu – This guided walk will look at the outside of St Pauls Cathedral and at a selection of Christopher Wren's finest City churches
Evensong Mass at St. Paul’s Cathedral – Every day – If you attend a choral Evensong service at St Paul's Cathedral then you can see a small part of the Cathedral for free.
Evensong Mass at Westminster Abbey – Every day (except Wed) – You can enjoy a choral Evensong service at Westminster Abbey, which combines a traditional mass with a choir.
Sunday service at the Tower of London – Every Sun (except during Aug) – You can attend a Sunday service at the Chapel Royal in the Tower of London -- one of the most historic churches in the City.
Choral Mass at Hampton Court Palace – Every Sun (except during the summer) – Attend a Sunday service in one of the country's most beautiful chapels -- Henry VIII's Chapel Royal at Hampton Court Palace.
Bach’s St. John Passion — Westminster Abbey – 16 Apr 2019 – Westminster Abbey will be celebrating Holy Week with a performance of Bach's St John Passion by St James' Baroque
Look for more religious events taking place in January
Here are some more free events in London if you want a cheap day out
Disclaimer: Event details can change at short notice and you should reconfirm everything before making plans