Just across the Danube river, discover a sanctuary carved into the limestone cliffs of the Rusenski Lom valley. This is the only inhabited rock monastery in Bulgaria. Climb the stone steps to view the cave chapels, ornate icons, and the serene gardens maintained by the resident monks.

Arrive in the "City of Tsars," dramatically perched on three hills. The highlight is Tsarevets Fortress, where you’ll walk through the royal gates, explore the ruins of the Patriarchal Cathedral, and see Baldwin’s Tower. Afterward, stroll through Samovodska Charshiya, the old market street, to see local artisans at work.

Step back into the 17th century in this architectural reserve.

You’ll visit the Konstantsalieva House, a preserved 17th-century merchant’s home that looks like a miniature castle.