Balduinseck Castle is located in the valley on the L 203 between the towns of Buch and Mastershausen and is freely accessible. The hilltop castle was built in the 14th century by Elector Baldwin of Luxembourg as a stronghold against the Counts of Sponheim, who resided at Kastellaun Castle. When it was built, Baldwin seems to have been particularly inspired by the French donjon type.
The castle was never destroyed but fell into ruin from the 18th century. Comprehensive renovation was completed in 2014, making the site freely accessible again. The 18-meter-high, four-story walls of the residential tower are still well preserved today. Today, Balduinseck Castle is a special highlight for many hikers.
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.