The Spanish city of Almería suffered up to 52 bombings from air and sea, with a total of 754 bombs dropped during the Spanish Civil War. This led to the decision to create a system of underground shelters for the protection of approximately 40,000 civilians. These shelters measure more than 4.5 km long, and they are equipped with a surgery room and a food storage room. They were designed by the local architect Guillermo Langle Rubio, being today the most important and better preserved shelters in all Europe. These refuges have stood the most important attack in all Almería's history, the Bombardment of Almería, by the nazis in 1937.
References:The ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.