The Kosciuszki Mound. Krakow. Poland. A large man made mound constructed in honor of Tadeusz Kosciuszko. Built in 1823. Constructed using soil from the battlefields where Kosciuszko fought. Snake-like paths lead to the top of the mound.
The Wieliczka Salt Mine in Krakow, Poland, has been mined continuously since the Middle Ages and miners have carved elaborate underground rooms and intricate sculptures within the Miocene salt. There is a gigantic subterannean cathedral carved entirely from salt including the floor, walls and decorations, with even the glowing chandeliers being made from salt crystals.