This is a drawing of an architectural structure resembling an altar with a cross. The image features a tall, ornate structure with classical elements such as arches, columns, and intricate decorative features. The upper section includes a prominent cross at the apex, surrounded by a semicircular relief showcasing cherubic figures within a decorative arch. Below, a wide central arch frames a recessed space, flanked by decorative panels on either side. This drawing appears to be a detailed architectural plan showcasing both the front elevation and a cross-sectional view, complete with measurement scales.