By the 1910s, Bogdan-Pitești's art interests gave birth to a collection of as few as 967 or as many as 1,500 individual works, most of them hosted by his estate in Colonești. They comprised objects created by prominent Romanian visual artists, including, alongside his early associates, Nina Arbore, Constantin Brâncuși, Oscar Han, Aurel Jiquidi, Maria Ciurdea Steurer, Constantin Medrea, Ary Murnu, Dimitrie Paciurea, Nicolae Petrescu-Găină, Alexandru Satmari, Francisc Șirato, Cecilia Cuțescu-Storck, Jean Alexandru Steriadi, Friedrich Storck, Ion Theodorescu-Sion, and Nicolae Tonitza. Of the total, around 900 works were of Romanian provenance. Among the foreign artists whose work was featured in the collection were Georges Rochegrosse and Frank Brangwyn. The section dedicated to newer works of art was designed and opened as the first the modern art museum in Romania.