British Museum and Leinster Gardens (S03E04)

Tim and Siddy set off on a nighttime stroll along the track to the deserted British Museum station. They uncover massive, hand-painted advertisements from the 1930s and striking white tiles. This station once functioned as a shelter during World War II, and remnants of the children who sought refuge there during The Blitz can still be spotted. Siddy then explores the elegant white-stucco homes of Leinster Gardens, which conceal a remarkable secret of the London Underground within their walls. These aren't genuine residences; instead, they represent a fascinating quirk in the history of the Underground's steam era.