Pompeii and Herculaneum are two ancient Roman cities, that are located near today's Italian city of Naples.
In 79 AD, the nearby volcano Mount Vesuvius erupted and buried these and some other cities under several metres of volcanic ash and pumic. From one moment to another, life  came to a stand-still and this  - luckily - preserved the culture and life or the Romans at that time.
It is estimated, that about 11,000 people lived in Pompeii and it had a complex water-system and infra-structure.  

The Basilika of Prompeii.

A shopping stall with bug buckets, where the food (or drinks) were stored.

The bath.

The walls of the houses of the rich people of Pompeii were covered with paintings and often obscenities.

Incredible wall paintings in Herculaneum.

The buried bodies were later filled with cement, so that you could see the people in their
very last moment of life.

  The infamous Mount Vesuvio vulcano, that destroyed Pompeii and Herculaneum in 79 AD.