The most spectacular of Bath's terraces is the Royal Crescent, built between 1767 and 1774 and designed by the younger John Wood. Wood designed the great curved façade of what appears to be about 30 houses with Ionic columns on a rusticated ground floor, but that was the extent of his input: each purchaser bought a certain length of the façade, and then employed their own architect to build a house to their own specifications behind it; hence what appears to be two houses is in some cases just one. This system of town planning is betrayed at the rear of the crescent: while the front is completely uniform and symmetrical, the rear is a mixture of differing roof heights, juxtapositions and fenestration. The "Queen Anne fronts and Mary-Anne backs" architecture occurs repeatedly in Bath and was designed to keep hired women at the back of the house. Other fine terraces elsewhere in the city include Lansdown Crescent and Somerset Place on the northern hill.