Espionage in London

“The Intelligence Trail” is a guided walk that visits sites in London where key intelligence decisions and operations took place over decades in MI5 and MI6 history.

At 7 p.m. Wed. and 2 p.m. Sat. and Sun., tours start at Royal Marines Memorial on the north side of The Mall beside Admiralty Arch. Groups of 30, maximum. Call (more than two hours ahead; may sell out) +44 [0] 1753 290 007 or visit www.intelligencetrail.co.uk. £10 cash, on site.