We have prowled the city streets, seeking out the hidden, eccentric, and overlooked. Far from the crowds and the usual clichés, London still reserves any number of hidden treasures for those who know how to wander off the beaten track. Pray at the Hyde Park dog cemetery, attend a clown service in a church, visit a real Freemason's temple, discover the rock from which Arthur is said to have extracted Excalibur, stand in awe of a pharaoh's sacred penis, play on the city's last grass petanque pitch, admire a rare cucumber straightener, a stuffed mermaid or Britain's smallest cathedral...