Luxembourg
The origin of the Pétrusse Casemates goes back to 1644, when the Spaniards reinforced the medieval fortifications and built large bastions.
After the 1867 Treaty of London the fortress to be dismantled and most of the entrances were closed. After the demolition, about 17 km of the casemates remained.
In 1933, the first visitors - initially with torches - were able to descend. In 1994 the fortifications of the city of Luxembourg and its old quarters were inscribed on the UNESCO World Heritage list.
You can buy tickets to tour several sections. This is looking out one of the openings onto the Grund Lower town, once protected by the medieval fortress.
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