With renovation of the unique Kohtla Mining Park-Museum in northeast Estonia expected to be completed in two weeks, the establishment is due to reopen to the public on July 2.
Much of the museum is located underground, in a 1.6 kilometer stretch of tunnel that was part of an operating shale mine until the operation closed in 2001.
Visitors are introduced the overall oil-shale mining process with demonstrations of machinery and other equipment by the museum's four guides, all former miners.
With the renovation work, the exhibits are being expanded and updated.
Although there are a number of similar museums in Europe, Estonia's is one of few that is not an above-ground replica and is located within an authentic mine.
Once reopened, the museum is expected to draw over 30,000 guests annually.
According to the establishment, Latvian and Russian tourists are particularly interested in visiting the museum.