In South Korea , a whole town goes underground to escape the heat . Think Seattle 's nice ? The 200 so-called underground cities of Cappadocia -- dense elaborate networks carved into the soft rock of the Turkish region , capable of sheltering thousands of people -- may have been started as long ago as the 8th century BC . Imagine the city beneath it . Drainage systems are dull but Tokyo 's is an engineering genius .
In South Korea , a whole town goes underground to escape the heat . Think Seattle 's nice ? Imagine the city beneath it . Drainage systems are dull but Tokyo 's is an engineering genius .