The Devonshire Dome
This impressive 18th-century building was designed by John Carr as a stable with room for 110 horses. In 1859, the circular area for exercising horses was covered with a slate-color, 156-foot-wide dome—bigger than that of St. Paul's Cathedral in London—and incorporated into a hospital. The University of Derby has taken over the building, which you can visit for free when school is in session. The Devonshire Dome is also home to the luxurious Devonshire Spa.