The major landmark is at the far western end, where the ruins of a 14th-century Knights Castle tower atop a cliff face. Its lower levels are occupied by an equally old monastery, Moni Panagias Spilianis, accessed by climbing a short but steep stairway.
WIth Nisyros being very short on beaches, local kids are glad of tiny but sandy Mandraki Beach, at the eastern end of town. It’s a popular swimming spot, despite being sometimes covered in seaweed. There’s also an exposed black-stone beach to the west, Hohlaki, reached by following a dilapidated and precarious footpath around the headland below the monastery. Don’t attempt this walk in bad weather.