The construction of Põltsamaa Castle was started in 1272. Between 1570 and 1578 it was the residence of Livonia's King Magnus. Repeatedly pillages, the castle was rebuilt by Woldemar Johann von Lauw in 1770 as a grand rococo-style palace. The castle, and the church built into its cannon tower, burnt down in 1941.
Põltsamaa St. Nicholas' Church was built from 1632 to 1633 on the site of earlier buildings. The nave was built on the 13th century gate buildings and the sanctuary on the 15th century cannon tower. The church was restored by 1952, and the castle ruins came under preservation during the 1970s.
Today the round courtyard holds a tourist information point and several museums including Põltsamaa Museum and a wine cellar with a food museum. There are also an art gallery, restaurant, handicraft and other workshops.
Easter Aquhorthies stone circle, located near Inverurie, is one of the best-preserved examples of a recumbent stone circle, and one of the few that still have their full complement of stones. It consists of a ring of nine stones, eight of which are grey granite and one red jasper. Two more grey granite stones flank a recumbent of red granite flecked with crystals and lines of quartz. The circle is particularly notable for its builders' use of polychromy in the stones, with the reddish ones situated on the SSW side and the grey ones opposite.
The placename Aquhorthies derives from a Scottish Gaelic word meaning 'field of prayer', and may indicate a 'long continuity of sanctity' between the Stone or Bronze Age circle builders and their much later Gaelic successors millennia later. The circle's surroundings were landscaped in the late 19th century, and it sits within a small fenced and walled enclosure. A stone dyke, known as a roundel, was built around the circle some time between 1847 and 1866–7.