The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

An eclectic collection of thousands of items owned by the sculptor Frederic Marès.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

This fountain was designed to honor the man who helped bring water to Barcelona.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

A section of the long chain that blocked enemy ships from entering Constantinople.

This beautiful train graveyard is one of the largest collections of steam locomotives in the Mediterranean and Europe.

Ancient serpentine sacrifice holder that has stood the test of time.

This museum was invented in a novel before being made real by the author.

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

Ottoman-era houses lovingly preserved.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Roman ruins top white travertine terraces formed by ancient hot springs.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Step back in time and witness the fall of Constantinople.

A charming beach town in Turkey captures all the colors of the rainbow.

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.

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

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

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

Cave on extinct volcano, once home to famous mathematician Pythagoras.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

This cheese shop also houses a museum devoted to Dutch dairy.