Schöne Grüße aus Daun

Postcard DE-3495274 was a nice greeting from Daun, Germany. It shows die Dauner Maare, a group of three volcanic lakes 2.5 km  (1.6 mi) to 3.5 km (2.2 mi) southeast of Daun’s town center. The main town of Daun has only about 5,000 permanent residents. It is known as a spa town and the mineral water springs in the surrounding area, due to the volcanic geological features in the area. Daun is home to the Eifel-Vulkanmuseum, a museum dedicated to provide information about volcanic and other geological phenomena in Eifel and world wide, using interactive computer models to explain the exciting and complex geological processes including both physical and chemical processes. 

Sunset over Kinko-wan Bay and Mount Sakurajima in Japan

Postcard JP-562080 from Japan was a jumbo picture card measured at 16cm x 25cm, showing a beautiful sunset view at Kinko-wan Bay and Mount Sakurajima in Japan. Sakurajima (桜島), meaning "Cherry Island", is an active composite volcano (stratovolcano) and a former island in Kagoshima Prefecture in Kyushu, Japan. The lava flows of the 1914 eruption caused the former island to be connected with the Osumi Peninsula, according to Wikipedia.

The postcard came with four Japanese Furusato (hometown) stamps: two showing Mount Tanigawa in Gunma Prefecture (above); the other two showing Mount Fuji, a World Heritage Site, on the border of Shizuoka and Yamanashi Prefectures (below).

Sunrise over Mount Zaō in Japan

Postcard JP-463262 from Japan shows a photo of beautiful sunrise at Mount Zaō (蔵王山) in Japan. Among the one hundred most famous mountains in Japan, Mount Zaō is a complex volcano that consists of a cluster of stratovolcanoes built up by layers of hardened lava, tephra, pumice, and volcanic ash. (Sources: Wikipedia) It is noted for a 360 m or 1,200 ft wide and 60 m or 200 ft deep crater lake Five Color Pond (五色沼) as the lake would change color depending on the weather.