What motivates humankind to burrow deep into the Earth? From London to Paris, Budapest to Moscow, the USA to Australia, here are seven of the most amazing examples in the world. Some were built for military defense or shelter, many are abandoned while others thrive. These amazing images feature tunnels, caverns, labyrinths from seven underground location around the world, following the acclaimed 7 Underwater Wonders and 7 Abandoned Wonders of the World from our 7 Wonders Series.
The ability to hide plain site can be a real advantage when exploring urban abandonments. Oooms has created a clever and collapsible solution to this problem as shown above. What appears to be an innocuous utility fixture is, in fact, a portable and hollow urban hideout that can be quickly and easily assembled and disassembled on-the-go.
What if you saw the building walls and other urban obstacles around you not as barriers, but as tempting challenges? Parkour practitioners and free runners do just that, putting into practice things most of us just associate with the movies. In real life, however, veterans practice these amazing arts of travelling quickly and smoothly through cities.
