[1] Geeraerts painted mainly interiors of churches and picturesque old buildings.
The church interior was a genre practiced in Northern European painting since the 16th century.
In the 19th century a few Belgian artists were also specialised in this genre including artists such as: Bernard Neyt, Jules-Victor Genisson, Joseph-Chrétien Nicolié, André-Joseph Minguet and Joseph Maswiens.
He also painting of the interior of the Nieuwe Kerk in Delft with a view of the mausoleum of William the Silent.
[1] He also painted in 1873 in frightening detail the ruins of the Antwerp stock exchange which had burned down 15 years earlier.