Paintings collected by the City of London since the 17th century, including pre-Raphaelite masterpieces. It also houses the Roman Amphitheatre, discovered in 1988 (free entry with gallery ticket). Mon-Sat 10am-5pm; Sun noon-4pm. Free 45-minute gallery tours every Tue, Fri & Sat afternoon. Admission free; charges for special exhibitions.

To 1 Dec: Architecture of London. A look at the city's ever-evolving landscape and how it has inspired creatives from the 17th century to today, with 80 pieces by over 60 artists.