Aerzen is a municipality in the Hamelin-Pyrmont district, in Lower Saxony, Germany.

Burg Aerzen, a castle built in the 16th century, was transformed into a cultural centre.

In Reher, a village which was incorporated into Aerzen in 1973, St. John's Chapel is worth a visit.

It was founded around 1100, built in a romanic style with a ridge turret covered with slabs of slate and two buttresses and enlarged in 1580.

[6] In the middle of Reher various well-preserved half-timbered houses can be visited, e.g. in "Förde" Street.