those drawing are very old. The church master told me that they were done by choir childrens in the ancient times.

The origin of the silver-lead mines Trémusson is Roman. It was already long pieces of Roman origin in the galleries. An excavation site has confirmed the original site, by the discovery of tiles to hook on both sides of the creek.

In the late 17th century, the English are precursors in the mining of nonferrous metals. They buy logging concessions in Britain. However, the site is still not exploited Trémuson. The concession is then awarded on 1 April 1732 to a Breton of Morlaix Guillotou of Kerver. Speculation around the precious metal is growing, which does not prevent the owner from going bankrupt due to a bad investment.

In 1740 the Mining Company of Lower Britain bought the concession. It will take 40 years to industrialize the mines. In 1782, more than 500 people work at the mine site. The size of the concession is over 90,000 hectares. It will never be fully exploited. At the end of the 19th century, the exploitation fall. The owners regularly change without success.

It was not until 1922 that the operation resumes. A laundry room is built on a hillside in 1924. She can wash the ore and the sort because the deposit is less rich than in ancient times. A year later, a foundry was built. The operation is successful for ten years, then the company suffers Dufourg the general crisis. In 1931, the mine was permanently closed. It will never be exploited.

Today, the mines are protected refuges for bats but the many miles of tunnels continue to drain the lead in the village by water infiltration. The villagers can not eat vegetables from their gardens or drink water polluted groundwater. There are remains of the laundry and the foundry behind the village.

source: patrimoine.region-bretagne.fr(FR)

This corridor is almost completely around one of the last level gave me the solution to the legend that surrounds the courthouse in Brussels. Indeed, the legend says there are so many rooms that nobody really knows the number. It would suffice to count them you say? Certainly, but the legend also says that some rooms are hidden! And it's true! This corridor will lead to narrowing to a dead end. But shortly before, once a straight line (since it is the turn of the last square base, so that makes 4 times) there is a steep staircase, added a bit anyway, which is sometimes blocked the passage a pipeline. This staircase leads into empty rooms mysteriously seem to have been recently refurbished (light, electrical outlets). Impossible to know what they were good or what they will be used, it is already difficult to access with empty hands, imagine the trouble we have to make a table! No other access to these rooms, no windows.

Control Room of the NATO radar base, the fort of Mount Salbert.

Fort Lefebvre culminates at the top of Mount Salbert 650m altitude. It said a strong "Sere River". It was built from 1874 to 1877. On May 12, 1955, NATO reuses the fort to house a communications center and a radar base. The book is officially delivered to the Air Force ole March 26, 1958. The book "G" Air Defense Planning (DAT) has 7 radio antennas. The old fort is used as a barracks for soldiers.

The radar base is not exactly the strong, but under the fort. Access from the fort is a long staircase of 322 stairs that descends into a concrete wall strongly.

The site is no longer running quickly but it remains occupied by the army until 1972. The mayor of Belfort is the current owner. It secures the site is now a promenade.

Vanne's reservoir. The consolidation of existing quarries in the location of these
Tanks was started September 7, 1868, under the direction of Mr. E. of Fourcy. Engineer
Chief Mining Inspector-General of careers by Mr A. Descos mining engineer: Interrupted
March 6, 1869, she was taken May 27, 1872 and completed January 31, 1874 under the direction
successive M M. JACQUOT DESCOTTES and chief mining engineers, inspectors general
Careers by Mr O. KELLER mining engineer. Mr. Trie and Mr. LAZIES contractors.

The Imperial Theatre du Chatelet was built between 1860 and 1862 by the architect Gabriel Davioud demand Baron Haussmann. Since 2002, the Theatre du Chatelet welcoming ceremonies Cesars film.

The Musée d'Orsay is actually an old train station. The Gare d'Orsay was designed by architect Victor Laloux in 1898. The station was inaugurated two years later, in 1900 at the Expo. Shortly after the Second World War, the station is decommissioned. There sometimes filming. In 1973, the station is included in the supplementary inventory of historical monuments. An architectural competition was organized in the 80s to rehabilitate the old station. The Orsay Museum was inaugurated in 1986.

source: Wikipedia

Quarries of Paris - Showroom mineralogy of the Rue Saint Jacques.

The showroom mineralogical most famous of Paris is the Salle Saint-Jacques. It was constructed by Major Gambier in the heart of the underground quarry system of the GRS (Great South network), just false catacombs at Denfert-Rochereau, in fact ossuaries in old underground quarries.

The side benches were used to display the site's geological curiosities. At the center of the room, a staircase dummy materialized superposition of limestone beds of the place. Each step was a sample. Originally, the name of each geological layer of rock was inscribed on the front steps of each room but this was very bumpy because too many visitors have visited illegal.

Can be found in certain geological showroom more difficult to access such information.

source: website of Zedou(FR)

The Palais de Chaillot was performed at the Universal Exhibition of 1937 by the architects Leon Azema, Jacques Carlu and Louis-Hippolyte Boileau, instead of the old Palais du Trocadéro. The Chaillot Palace is composed of two pavilions and two curved wings flanking the esplanade of human rights. The facades and roof of the palace, its courtyard and terrace staircase, its remaining home decor (except theater review) have been classified as historic monuments December 24, 1980. It houses several museums.

source: Wikipedia

The viaduct Garabit is made entirely of metal. It was built by Gustave Eiffel & Cie in 1884 under the direction of the architect Leon Boyer. It is 564m long. Since the construction of the dam Grandval, a lake was formed under the viaduct, 95m below. Trademark Construction of Eiffel, it is no less than 678,768 rivets were used for construction.