Big Space Rockets are always good, aren't they, and curiously consoling. As are evil megalomaniac robots, who were surely inspired by some scriptwriter/ set designer's fear of old broadcasting eqipment (the Cybermen's big helmets bear a suspicious resemblance to big old-fashioned earphones...)

I am also looking forward to the Conspiracy across Space and Time in City of Death, which apparently involves the Mona Lisa. A bit like The Da Vinci code, only written by Douglas Adams and with a more realistic approach to history... /snark.