City secrets

"Near the South Pole, on a rock surrounded by ice, there is a small city called McMurdo Base. How did it get there? What is it like there? Ane why do people live in all that cold?"--Back cover.

"Venice is sinking! More and more water floods the plazas, but people are working to save this historic Italian city. What can they do, with rising water all around?"--Back cover.

"Deep inside a mountain, people in NORAD work to defend against an attack from the skies. Why were they hiding under a mountain?"--Back cover.

"Every year, when the floods come to Cambodia, the Great River runs backward. The town on the Great River floats, and spreads out over a vast lake. How do the people live without land?"--Back cover.

"Hidden under the modern city of Seattle lies another older and forgotten one. Why did the people build over their streets?"--Back cover.

"Many years ago, young men disappeared under the streets of Portland. They were hidden in tunnels and forced to work on ships"--Back cover.