Gåseborg was an magnificient ancient hill fort built in the Iron Age, about 1500 years ago. It was built of stone without any masonry. According the archaeological excavations the fort has been also a temporary residence. For example remains of golden artefacts have been found from the site.
References:These are great photos, thanks for uploading. I grew up in Viksjo and used to play on this mountaintop. Would love to visit today and take some photos, but I live in the US now. Thanks!
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.