6 Best Sights in The Peloponnese, Greece

This Byzantine and Frankish structure incorporates remnants of classical walls and was later expanded by the Turks and Venetians. You can drive almost to the entrance, and the grounds provide an unsurpassed view of the Argive plain.

A kilometer-long seaside promenade skirts the Nafplion Peninsula, paved with flagstones and opening every so often to terraces planted with a few rosebushes and olive and cedar trees. Along the south side of the peninsula, the promenade runs midway along a cliff—it's 100 feet up to Acronafplia, 50 feet down to the sea—and leads to Arvanitia Beach, a lovely place for a dip. Here and there a flight of steps goes down to the rocky shore below. Be careful if you go swimming here, because the rocks are covered with sea urchins, which can inflict a painful wound. Directly above the beach, starting at the car park, a forested path wraps its way for 4 km (2½ miles) around the coast to the sands of Karathona, passing umpteen stretches of wild rocky shore along the way; it makes a wonderfully shaded and scenic stroll.

This mountainside monastery, altitude 3,117 feet, was founded in the 4th century and is said to be the oldest in Greece, though it has been burned down many times, most recently in 1934. The community once had 450 monks and owned vast tracts of land in the Peloponnese, Constantinople (now Istanbul), and Macedonia, making it one of the richest in Greece. Mega Spileo sits at the base of a huge (360-foot-high) curving cliff face and incorporates a large cavern (the monastery's name means "large cave"). You can tour the monastery to see a charred black-wax-and-mastic icon of the Virgin, supposedly painted by St. Luke, found in the cave after a vision of the shepherdess Euphrosyne led some monks there in AD 362. Also on display are ornate vellum manuscripts of early gospels and the preserved heads of the founding monks.

Modest dress is required; wraps are available at the entrance.

If you're taking the Kalavrita Express, 45 minutes into its trip you can alight at the stream-laced mountain village of Zakhlorou, from where you can hike up a steep path through evergreen oak, cypress, and fir to the monastery. This hour-long trek (one-way) along a rough donkey track gives you superb views of the Vouraikos valley and distant villages on the opposite side. The occasional sound of bells, from flocks of goats grazing on the steep slopes above, is carried on the wind. It's also possible to take a cab from the village, though they are not always available; if you're driving, the monastery is just off the road between Diakofto and Kalavrita and is well marked.

Nafplion's pocket-size fortress is a captivating presence on a speck of land in the middle of the harbor generously called St. Theodore's Island. The Venetians completed a single tower in 1473, and they enlarged it with a second tower and bastion when they recaptured Nafplion in 1686. Freedom fighters captured the Bourtzi during the War of Independence in 1822 and used the island to bombard the Turks defending the town. The new Greek government retreated to the island in the unsettled times following the revolution; after 1865, the fortress was the residence of the town executioners. Boats leave on no fixed schedule from the eastern end of Akti Miaouli for €5; at the time of writing, ongoing works on the castle meant that access to the fortress continues to be partly restricted.

Remains of the classical city are scattered throughout the modern one, and you can see in a small area the extensive ruins of the Roman bath, odeon (a roofed theater), and agora, or market. The theater is especially striking, and its well-preserved seats climb a hillside.

This is one of the largest churches in Greece, and dates from the early 20th century. It is built next to a spring that's been used for thousands of years, and during antiquity its waters were thought to have prophetic powers. St. Andrews is an important pilgrimage sight—the cavernous interior houses the head of the namesake saint, who spread Christianity throughout Greece and was crucified in Patras in AD 60.