Other sights accessed during shore excursions via bus include Bulgaria's Belogradchik Rocks, which are naturally carved towering red rock pinnacles that appear to take forms such as "Madonna with ...

The famed cathedral is open to visitors from 8 a.m. to 7 p.m. daily, except for Thursdays when it closes at 10 p.m. Bookings open 48 hours in advance and are snapped up quickly. Late morning and ...