The Barbican Centre | EC2Y 8DS

Hidden in the heart of London City, the Barbican Centre is home to apartments, art exhibitions, shops, a Library, Museum, conservatory, church, movie theatre and musical performance space. 

In fact, it's the largest performing arts space of its kind in Europe (London's still in Europe, right?).

Opened in March 1982, this ugly-pretty brutalist 35 year old has been forgotten by younger Londoners. Let me refresh your memory...

Barbican Conservatory

Free London | Mudlarking

Free London | Mudlarking

"A mudlark is someone who scavenges in river-mud for items of value, a term used especially to describe those who scavenged this way in London during the late 18th and 19th centuries." - thanks wikipedia 

An activity unique to London and costs (almost) nothing...?

This is not a drill.