has authentic 19th century gas lamps from Baltimore along the "Main Street, U.S.A." section of the theme park. Prague, where gas lighting was introduced on 15 September 1847, had about 10,000 gas streetlamps in the 1940s. The last historic gas candelabras become electrified in 1985. However, in 2002–2014, streetlamps along the Royal Route and some other streets in the centre were rebuilt to use gas (using replicas of the historic poles and lanterns), several historic candelabras (Hradčanské náměstí, Loretánská street, Dražického náměstí etc.) were also converted back to gas lamps, and five new gas lamps were installed in the Michle Gasworks as a promotion. In 2018, there were 417 points (about 650 lanterns) of street gas lighting in Prague. During Advent and Christmas, lanterns on the Charles Bridge are managed manually by a lamplighter in historic uniform. The plan to reintroduce gas lights in Old Prague was proposed in 2002, and adopted by the Municipality of Prague in January 2004. Modern indoor usage The use of natural gas (methane) for indoor lighting is nearly extinct. Besides producing a lot of heat, the combustion of methane tends to release significant amounts of carbon monoxide, a colorless and odorless gas that is more readily absorbed by the blood than oxygen, and can be deadly. Historically, the use of lamps of all types was of shorter duration than we are accustomed to with electric lights, and in the far more draughty buildings, it was of less concern and danger. There are suppliers of new mantle gas lamps set up for use with natural gas; and, some old homes still have fixtures installed, and some period restorations have salvaged fixtures installed, more for decoration than use. New fixtures are still made and available for propane (sometimes called "bottle(d) gas"), a product of oil refining, which under most circumstances burns more completely to carbon dioxide and water vapor. In some locations where public utility electricity or kerosene are not readily accessible or desirable, propane gas mantle lamps are still used, although the increased availability of alternative energy sources, such as solar panels and small scale wind turbines, combined with increasing efficiency of lighting products, such as compact fluorescent lamps and LEDs are also in use. For occasional use in remote cabins and cottages, propane mantle lamps may still be more economical and less labor-intensive than an alternative energy system. Other uses Perforated tubes bent into