Sometimes the most impressive structures and cities aren’t what we see above ground, with beautiful skyscrapers and expansive parks. Sometimes the coolest feats of nature and architecture are hidden underground and have been for centuries.
While some are simple cave homes, others are full on complexes with malls, galleries, churches and infrastructure. A lot of them are built to withstand nuclear attacks, while others were made for more basic reasons. In any case, all of these are incredibly fascinating and undeniably awesome.
Check them out.