Not the most exciting place inside, but a lovely rooftop area which not all that many people seem to know about, 2 mins walk from Old St station. If it’s packed then The Red Lion is just up the road.
Founded in 1828 the museum houses around 67,000 specimens many of which are now extinct or endangered. My favorite is the skull of a Bottlenose Whale from 1860.
A brilliant little hidden gem of a place to relax and look at some interesting rare / Out of print books and Magazine. Their evening art events are also very special. Great atmosphere and great people.