The cemetery of the church contains several graves of victims from Nazi concentration camps who were taken to a field hospital in Lärbro during and after World War II.

Archaeologists have discovered the remains of two ancient causeways connecting the two sides of the swampy valley.

Among those treated in the field hospital were refugees fleeing the occupation of the Baltic states, German soldiers and around 500 victims from the Nazi concentration camps Auschwitz and Bergen-Belsen.

[10] At the end of the 13th century, a complete rebuilding of the church was initiated, resulting in the present Gothic building.

[12] It was about 6 metres (20 ft) higher at the time of construction; the top part of the tower was severely damaged in a storm in 1522, and had to be demolished.

[14] The most unusual feature of Lärbro Church is the octagonal tower, which is also one of the most singular medieval buildings on Gotland.

[11] The tower appears to be the work of a workshop which was active at several churches on Gotland during the 14th century and known by the notname Egypticus [sv].

[15] Apart from the octagonal shape, the pinnacles and gargoyles adorning the tower also appear to have Visby Cathedral as their model.

[20] The ground floor of the tower is covered by an eight-celled vault and lit by the large windows, creating a light and relatively lavish room, in contrast to most other churches on Gotland.

The shape of the tower could then possibly be a reference to the octagonal chapel in Nidaros Cathedral in Trondheim, Norway, where the relics of the saint are kept.

[24] It has a straight eastern wall and a group of three lancet windows, a common feature among the churches on Gotland.

Its portal is decorated with floral ornamentation and a single figure, again possibly depicting Saint Olaf.

[8] Inside, the nave is divided by two central pillars, constructed of alternating red and grey limestone, and six corbels into six bays.

They decorate the nave and chancel, where some of them have incorporated architectural details in the composition, an uncommon feature among church murals in Sweden.

[12][13] Other murals are purely ornamental, and some also depict more traditional religious subjects such as the Crucifixion and saints.

[27][13][27] The church also possesses a chair made of lathed wooden elements, dating from the 13th century.

[28] The baptismal font of the church, decorated with festoons, is made of sandstone and dates from the end of the 17th century.

[30] Lärbro Church is an ecclesiastical monument, number 21300000002813 (sub-number: 21400000444059) in the buildings database of the Swedish National Heritage Board.