This 3,000-year-old “opium black fortress” towers over the ancient town named after it.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

A meow-velous tribute to a beloved street cat, made famous on the internet.

The ornate miniature mansions were built for Istanbul's feathered residents.

The only Roman honorific column in Istanbul.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

One of the newest mosques in a city filled with thousands.

This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

Seven early Christians were sealed into a cave where legend has it they slept unharmed for centuries.

These ruins once flourished as the capital of the Lydian kingdom, often credited with the invention of metal coinage.

This elevator was built in 1907 to connect two neighborhoods separated by a steep, rocky cliff.

An underground network of massive stone arches and their skylit vaults support ruins of portico structures above.

This saucy statue once caused outrage among locals.

One of London’s rare Tudor-era buildings is a fate-defying gatehouse for a church.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

A martyred saint built a nunnery and school for girls here known as the "Parthenon."

Legend says this sacred tree was a gift from goddess Athena.

An ancient octagonal weather station named for the eight Greek gods of wind.

The ruined doorway is a portal to the building's turbulent and torturous past.

This striking sculpture of Icarus honors Greece's fallen flyers.

Luminaries of all stripes have sipped strong Greek coffee at this cafe since 1839.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.