Unesco description
Human activity in the magnificent natural landscape of the Salzkammergut began in prehistoric times, with the salt deposits being exploited as early as the 2nd millennium BC. This resource formed the basis of the area’s prosperity up to the middle of the 20th century, a prosperity that is reflected in the fine architecture of the town of Hallstatt.

Received through Postcrossing on 12.11.2010
Hallstatt is known for its production of salt, dating back to prehistoric times. The world´s first known salt mine, Salzwelten, is located near the town of Hallstatt.

Trivia:

A full scale replica of this town was built in Huizou, China by a Chinese mining company.

Received through Postcrossing on 27.09.2017
Dachstein mountain is 2995 meters high and has lots of caves in it. The summit was first reached in 1832.

Received from Marlene on 12.07.2022
This card shows the Gosausee, at 3.004m altitud