Underground Living: 10 Amazing Cave Homes, Hotels and More

Cave Post Office – Slovenia

A deep cavern like this might seem like an unlikely place for a post office, but this cave in Slovenia gets its share of foot traffic. The post office in the Postojna Concert Hall is mostly an afterthought, a small section to serve guests of the cavernous concert hall in this cave system. It is the first of its kind in the world, a bit of bragging rights to attract new guests to the underground facilities. The contemporary design and the natural cavern it inhabits makes it a place to behold, currently the only one in the world.