Artificial underground mines are usually impossible to enter after closing in Finland. They're quickly fillt with natural water, or the tunnels are exploded inaccessible in the name of safety. However, the areas may have some interesting buildings, structures or other leftovers. Another noteworthy group are quarries, which offer cool views.
AIJALA
Kisko, Varsinais-Suomi. Zinc mine.
FÖRBY
Särkisalo (Finby), Varsinais-Suomi. Limestone mine.
HAVERI
Ylöjärvi (formerly Viljakkala), Pirkanmaa. Gold quarry.
KAATIALA
Kuortane, Etelä-Pohjanmaa. Feldspar quarry.
KORSNÄS
Malax (Maalahti), Pohjanmaa. Lead mine.
KOTALAHTI
Leppävirta, Pohjois-Savo. Nickel mine.
MAKOLA
Nivala, Pohjois-Pohjanmaa. Nickel mine.
MONTOLA
Pieksämäki (formerly Virtasalmi), Etelä-Savo. Limestone mine.
ORIJÄRVI
Kisko, Varsinais-Suomi. Copper quarry.
ORIVESI
Orivesi, Pirkanmaa. Gravel pits.
PAAKKILA
Tuusniemi, Pohjois-Savo. Asbestos quarry.
SP-MINERALS
Kimito (Kemiö), Varsinais-Suomi. Operating mineral mine.
UHLU
Vehmaa, Varsinais-Suomi. Stone quarry.
VIHANTI
Vihanti, Pohjois-Pohjanmaa. Zinc mine.
ÅVENSOR
Korpo (Korppoo), Varsinais-Suomi. Limestone quarry.