Exploring underground may be the most successful way to support sustainable urban development. While experts figure out whether digging into the ground can solve the urban space problem, we take you to the world's most unique underground marvels.
Built in 1996, this hobbit-like house in the Welsh countryside is a tunnel under a turf roof. The three-bedroom house with stunning ocean views resembles a home that featured in a famous British children’s TV show — locals call it the Teletubby house.
In Poland, you have to take 800 steps down a shaft to reach this art gallery, health resort, and massive halls that host weddings and conferences — all rolled into one. This 13-century marvel was once a salt mine.
Built into a rock, the Temppeliaukio Church in Helsinki gets ample sunlight through a glazed dome. Those rough rock walls were left untouched by the designers for a reason: naturally great acoustics make the church a perfect venue for concerts.