The mountain features impressive basalt columns formed by cooling lava. Despite its name the mountain features very little scoria, with most of the mountain made up of vesicular basalt. The Thangool Cup Races is an annual horse racing event held in September. Each November there is a Christmas market. Mordehai Dubin  Mordehai Dubin (; January 1, 1889, Riga, Governorate of Livonia, Russian Empire — 1956, Tula, USSR) was a major Jewish spiritual and political leader in Latvia. He served as a Member of Parliament ("Saeima") for the Agudas Israel party. He headed the Jewish community in Latvia until 1940, when it was annexed by the USSR. Due to his efforts, the imprisonment of the famous "Lubavitcher" Rebbe Yosef Yitzchok Schneersohn in the USSR in 1927 was commuted to exile in Latvia. Dubin was a personal friend of Kārlis Ulmanis, the nationalist authoritarian dictator of Latvia from 1934 to 1940. Dubin was deported from Latvia by the Soviet authorities in 1940 and released in 1942. After World War II he returned to Riga where the local press attacked him violently, of course under orders from above. He was arrested again and deported in 1948. He lived under arrest and exile in Siberia, first in Samara, and later in Tula, where he died in 1956 in a labor camp and is buried. New York City steam system  The New York City steam systems include Con Edison's Steam Operations, and other smaller steam systems that provide steam to New York University and Columbia University. Many individual buildings in New York have their own steam systems. Con Edison's Steam Operations are a district heating system which takes steam produced by steam generating stations and carries it under the streets of Manhattan to heat and cool buildings and businesses in Manhattan. Some New York businesses and facilities also use the steam for cleaning and disinfection. The New York Steam Company began providing service in lower Manhattan on March 3, 1882. Today, Consolidated Edison operates the largest commercial steam system in the world (larger than the next nine combined). The organization within Con Edison responsible for the system's operation, known as Steam Operations, provides steam service to over 1,700 commercial and residential customers in Manhattan from Battery Park to 96th Street uptown on the west side, and 89th Street on the east side of Manhattan. Roughly of steam flow through the system every year. Steam provides heat and cooling to many buildings in New York.