City of Caves

S1 E6: Budapest, Hungary is a burgeoning Easter European metropolis sitting on top of an ancient secret - a secret that dates back to the dawn of time. The caves beneath Budapest were formed during the ice age and everyone from the cavemen to the communists have moved their city into the depths of this parallel world. Host Eric Geller has special access into this sealed up time capsule - where he'll uncover a top secret WWII hospital, find the source of the boiling healing water used by both the Romans and the Turks, and see the layers of support added throughout the centuries to keep today's world from falling into the one buried below. We're peeling back the layers of time on Cities of the Underworld: City of Caves.