Rachel on the way up to Prague Castle. (Photo/Sketch: Jonathan)

The glorious interior of St. Vitus Cathedral. (Photo/Sketch: Jonathan)

Stained glass (left) and gold-enhanced mosaic (right) inside St. Vitus Cathedral. (Photo/Sketch: Rachel)

Rachel, awestruck by the stained glass and enormity of the Cathedral...or is she looking for a bathroom? (Photo/Sketch: Jonathan)

An art nouveau stained glass window in St. Vitus Cathedral. (Photo/Sketch: Jonathan)

Close-up of art nouveau stained glass, including signature panel. (Photo/Sketch: Jonathan)

All the windows of St. Vitus Cathedral were intended to be clear glass by the original architects, but because the structure took so many centuries to complete, only the original nave's windows are clear. (Photo/Sketch: Jonathan)

We climbed almost 300 steps in one of the Cathedral towers for a view of the surrounding palace. (Photo/Sketch: Jonathan)

A rooster wind vane atop St. Vitus Cathedral. Another rooster presides over the astronomical clock in Prague's Starmestske namesti (Old Town Square). (Photo/Sketch: Jonathan)

During lunch, Jonathan sketched the alleyway between the cathedral and the palace in his journal using a Style pen. (Photo/Sketch: Jonathan)

Each gargoyle on St. Vitus has a different personality. (Photo/Sketch: Rachel)

This statue guards one of the entries to Prague Castle. (Photo/Sketch: Jonathan)

Rachel in the forested terraces opposite Prague Castle. (Photo/Sketch: Rachel)

Kralovska zahrada (Prague Castle's gardens) includes this structure called Micovna. (Photo/Sketch: Jonathan)

Micovna's facade is decorated with sgraffito, a technique of applying white plaster to a dark background, then scraping away areas to reveal that dark background. (Photo/Sketch: Jonathan)

Even statues need to relieve themselves sometimes. Forgive their rudeness -- they're only children. (Photo/Sketch: Jonathan)

Above Mala Strana (Little Quarter) and Prague Castle in the terraced gardens. (Photo/Sketch: Rachel)