This ruined castle perched atop a rocky peak is a great place for a hike.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

A sharp sculpture made of thousands of pieces of jagged glass.

A crushed gate and giant bronze head serve as a reminder of Greece's fight for freedom.

The heads and relics of 179 monks slaughtered by pirates are on display within this Ceonobic Monastery.

Hideout of thieves, monks, and goat-footed gods.

This seaside sanctuary was once one of the most important religious sites for women in ancient Greece.

Public water fountains built during the Ottoman Era still stand throughout this seaside town.

The historic building has preserved human organs, unusual hexagrams, and scars from a political assassination.

This church is dedicated to the patron saint of seafarers.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

This 200-meter-high waterfall marks the site of Achilles’s immortal baptism at the mouth of the River Styx.

The hallucinogenic center of the ancient world.

An islet filled with wooden houses where the open sea meets a lagoon.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

This 13th-century monastery chiseled into the side of a mountain is equipped with a bridge that can be lifted to protect against raids.

Monasteries on rock pillars, once accessible only by frayed ropes.

An artistic melting pot inside an old roadside inn from the Ottoman era.

An abandoned Byzantine fortress and notorious prison.

An 11th-century Byzantine church with medieval Serbian history and spectacular views.

This medieval monastery represents an architectural blend of eastern and western European culture.

This natural monument has an origin story steeped in legend.