Edinburgh Vaults, Scotland

Constructed within the 19 arches of South Bridge in Edinburgh sometime in the late 18th century, Edinburgh Vaults are a series of chambers created due to downward expansion.

These artificial “underground” vaults were originally blooming with traders such as taverns, cobblers, smelters, and so on. But, soon, the wear and tear began due to the lack of proper sanitation systems and drainage.

In 1985, these forgotten, dark, damp places were discovered due to excavation. This ancient underground city resulted from the superstitions of the city’s people, and to date, it’s regarded as the most haunted place in the UK.