When was Big Ben built?
1843
1859
1859
1859
1859
1859
1859
1859
1873
1859
1907
1873
1859
1874
1907
1873
1859
1874
1907
1873
1859
1874
1907
1856
1873
1859
1874
1903
1907
1856
1899
1873
1859
1874
1903
1907
1872
1856
1899
1873
1859
1876
1874
1903
1907
1872
1856
1909
1899
1873
1859
1876
1874
1903
1907
1872
1858
1856
1899
1873
1913
1859
1876
1874
1903
1907
1872
1902
1856
1899
1873
1890
1859
1874
1903
1907
1909
1889
1878
1856
1899
1915
1873
1872
1859
1874
1903
1907
1905
1840
1913
1858
1876
1856
1873
1902
1859
1859.
1874
1903
1907
1909
1889
1890
1856
1904
1878
1915
1873
1872
1859
1874
1907
1859.
1899
1905
1840
1913
1858
1876
1856
1873
1902
1874
1903
1907
1909
1889
1878
1859.
1890
1904
1899
1905
1915
1859,
1873
1872
1874
1907
1859.
1902
1840
1913
1858
1876
1856
1873
1859,
1890
1874
1903
1907
1909
1889
1840s
1878
1872
1859.
1904
1899
1912
1905
1915
1890s
1873
1840
1858
1874
1859,
1907
1871
1902
1913
1876
1856
1859.
1873
1890
1874
1903
1907
1909
1889
1878
1872
1840s
1859,
1904
1899
1912
1859.
1905
1915
1873
1840
1858
1856
1907
1931
1871