- Conglomerate
Quarz conglomerate, Hertfordshire puddingstone, St Albans, England - Basalt
Different forms of basalt - Santi di Tito - Detail
Santi di Tito - Detail. Museo Civico, Sansepolcro. - Federico da Montefeltro and his son
Federico da Montefeltro and his son (1476) by Pedro Berruguete. Palazzo Ducale, Urbino. - The Monument to Philopappos
The Monument to Philopappos, Athens (1805-1807) by Giovanni Battista Lusieri. This is the painter's only known oil painting, everything else are watercolours.