Room A at the National Gallery in London is open obscure hours:
The reason for this obscurity lies in the opening times. You can only gain access for 3.5 hours a week, on a Wednesday afternoon. … While much of the hangings are certainly B-list (how many adoring magi or storm-tossed Dutch vessels do we need?), it’s worth remembering that this is the National Gallery’s B-list. Many of these paintings would take centre stage at lesser venues. This intense Sargent portrait, for example, would surely make a huge impact if hung elsewhere. Raphael is down here. And Caravaggio. And Rembrandt. If you’re one of those people who likes sketching in galleries, Room A with its huge variety and sepulchral quietness is your new best friend.
Seems of a different sort of “outing” than that of the underground restaurants in New York City.
The Londonist gives directions to Room A.