Underneath Finsbury Park

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It's common knowledge that London is a city full of secrets lurking around every corner - the city's history and legacy mean that you never quite know what wonders are hidden under London's cobbled streets. When it comes to these secrets, one London park has a massive secret hidden right beneath the grass.

Hidden underneath Finsbury Park is a giant disused reservoir that can hold a staggering five million gallons of water. But it's actually empty at the moment. The stunning location has attracted photographers and urban explorers who have dared to descend into its depths through a little-known manhole located inside the park.

Hornsey Wood Reservoir was completed in 1869 by the East London Waterworks Company and used to provide water to the surrounding areas of North London. Because of its stunning architecture, the reservoir has even been used as a filming location in blockbusters such as Skyfall and Paddington. It was also a filming location for Sherlock Holmes in 2009.

Hornsey Wood Reservoir belongs to Thames Water, who identified a structural defect in one of the arches during a 2012 inspection, according to Haringey Council park management documents, which meant the area of the roof was fenced off for a short period while necessary work could be carried out.