An abandoned Byzantine fortress and notorious prison.

One of the most photographed locations in the entire city.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

Gargoyle head that brings good luck.

An ancient knight and a symbol of the city's freedom.

Longest fortress system anywhere in Europe.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

Home to the oldest operating roller coaster in the Southern Hemisphere.

The heads of two giant mythological water horses honor Scotland's horselord past.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

A mesmerizing reservoir nestled at the heart of a pre-Islamic Yemeni village.

Yemen's "Stone Palace" looks like it was carved right out of the tall stone column on which it is built.

Elaborate patterns adorn the city's disappearing traditional architecture.

The ancient abodes are a testament to human ingenuity amid harsh climates.

Mausoleum and Holy Seat of Antiochus I of Commagene.

Balanced on four stone pillars, this historic tower was the site of a tragic political assassination.

This ancient city—home to nine civilizations—is soon to be buried under 200 feet of water.

This ancient Silk Road outpost overlooking the Wakhan Valley is miraculously still standing.

A strip of neutral ground where the people of Tajikistan and Afghanistan come together to trade.

This 1000 year old relic-filled cave monastery and UNESCO World Heritage Site also hosts an amazing micro-miniature museum.

The Avenue of Mausolea is a series of grand palatial tombs.

An 18-meter-long sarcophagus of a constantly growing dead prophet.

The remains of an ancient city-state along the Silk Road.

This dark, damp, perilous tunnel is the only passage from north to south Tajikistan.