Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Ring the bell to enter a bar that looks equal parts museum and old curiosity shop.

The world's oldest bookshop still in operation.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

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

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

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

These ruins once made up the capital of Lydia, where metal coinage was allegedly invented.

The eclectic home of a leading Turkish architect is a gorgeous piece of eye candy.

This hidden gem is bathed in beautiful natural light.

The ancient latrines of the Greeks, in all their public glory.

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

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

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

A sixth-century Byzantine cistern hidden below a modern carpet store.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

The best-preserved ancient theater in the world.

Ottoman-era houses lovingly preserved.

Flames have been burning within this mountain for more than 2,500 years.

Live a night as a Byzantine King, with a minibar and private jacuzzi.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.