Mysterious Underground Tunnels and Bunkers for the Adventurous Traveler

14. The Hypogeum of Ħal-Saflieni – Malta’s Prehistoric Underworld

Deep beneath the streets of Paola, Malta, lies one of the world's oldest and most enigmatic underground structures—the Hypogeum of Ħal-Saflieni. This prehistoric temple, estimated to be over 5,000 years old, consists of a vast network of chambers, passageways, and burial sites carved directly into limestone. Unlike other underground sites, the Hypogeum remains a mystery due to its advanced engineering and the discovery of elongated skulls that have sparked countless theories. Some believe the temple served as a necropolis, while others speculate it was used for ritualistic purposes. Visitors can descend into the eerie depths of the Hypogeum, exploring its labyrinthine halls adorned with red ochre paintings, whispering secrets of an ancient civilization long forgotten.