Cēsis is in the centre of the Gauja National Park, but it is not part of the park as such. There are many interesting places in Cēsis to visit and examine. The oldest part of the town is of key interest. The origins of Cēsis can be found at Riekstu hill, which is 18 metres high. Between the 11th and 13th century, there was a wooden castle here built by the Vendians. The hill is in the central part of the castle park, and it offers a good view of the park, pond and the ruins of the Cēsis castle, which can be accessed via a long cascade of stairs. The Cēsis castle (see below) was built in the early 13th century as a residence for masters of the Livonian Order, and it was one of the strongest fortresses in the Baltic territories. Alongside it is the New Cēsis castle, which was built in 1777 where the gate fortifications once stood. The Cēsis Museum of History and Art is in the building, alongside which is a visitors centre and the Cēsis Tourism Information Centre. From the tower of the castle, there is a fine view of the castle ruins, St John's Lutheran church and the northern part of the town. Opposite the New Cēsis castle are stables and a wheelhouse (both from the first half of the 19th century). The Cēsis Exhibition Hall is there today. You can look at the exteriors of the granary, the hut for coachmen, and the old brewery. On the other side of the street is the romantic Maija park, which was installed in the 1830s. The park is popular among parents with children, because there is a playground there. From this area, you can walk down some of the old streets of the town – Lielās Katrīnas, Mazās Katrīnas, Mazā Kalēju, Kalēju and Lielā Līvu streets, plus Līvu Square. The wooden buildings along the streets date back to the late 18th and early 19th century. Torņa Street, which weaves its way along the defensive walls of the Medieval castle, offers a look outside the church of a sculpture by Matiass Jansons, "As the Centuries Pass". Legend says that if you rub the lantern carred by the Old Man of Time, you can see the future. One of the most impressive buildings in Cēsis is St John's Lutheran Church, which was built in the late 13th century for the Livonian Order. It is a basilica built in the Roman style and with Gothic elements. The tower, which is 65 m high, was built in 1853. The building was reconstructed several times during the 20th century. Inside the building are grave epitaphs for masters of the Livonian Order and for bishops. The pulpit was installed in 1748, the oak altar followed in 1858, and the altar painting "The Crucified One" dates back to 1862. The stained glass windows around the altar are of great artistic value. The organ was built in 1907 by the E.F. Walker Company, and the instrument is one of the best concert organs in Latvia. A sun clock featuring the year 1744 is at the south-western corner of the church. It is worth climbing the church's tower. At the foot of the building is Rose Square, which began as a market square in the mid-19th century, remained in place until 1927, and was restored in 2008. This is the central square in the town today. During the Medieval Era, there were stockades here, along with the city's well. Rīgas Street has been the main street of the old town from the very beginning, and it is here that you will find the most architecturally outstanding buildings in town from the 18th and 19th centuries. They include the former Cēsis City Hall, the Fābers building, and the Princess building. At one end of the street is Līvu Square, where, during the 13th century, there was a church, a cemetery and a gate in the town walls. Today the square features a lighted fountain which is on the site of a 13th century well known as Lejas Šķimbēgs. At the other end of the street is a reconstruction of the foundations and surface elements of the Rauna gate that was a part of the town walls in the 14th and 15th centuries. The site offers a good idea about Medieval fortifications and the size and mightiness of gates therein.

During restorations of the tower of the Kolka Lutheran church in the 1990s, a document was found which spoke to the conversion of many Livs to the Orthodox faith.  The document was placed in the tower in 1885, when the church was being constructed, and it says that the decision by Livs to join the Orthodox church was based not on faith, "but instead as a resource for accessing advantages in relation to land."  The Orthodox congregation purchased land from a local aristocrat in 1885, and in 1990, a church, manse and school were built on the land.  All three buildings have survived to the present day.  The church has its own congregation, and worship services are held once a month.  There are news to show that Kolka is the only Liv shoreline village in which an Orthodox church was built during the 1890s.  The church's bell dates back to 1936.  During the Soviet era, the church was used as a mortuary, but today its original functions have been restored to it.