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

Where commuters walk through remnants of an ancient Greek necropolis.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Elaborate tile work in this railway station tells the story of Portugal.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The modern birthplace of Irish freedom.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Home to three historic ships from the age of Vikings.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

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

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

Ancient artists in the middle of nowhere.

A blooming house of worship for the masses.

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

Where thousands of slaves passed through the "Door of No Return."

This Stone Age solar temple aligns with the sun on each equinox and solstice.

The world's most active stratovolcano is almost always erupting.

An ancient capital city that dates back 3,000 years and harbors many surprises.

Village of slate houses, built on a white marble outcrop.

Whitewashed mosque contains the world's largest carpet.

A British general, a suggestive tree, a map of paradise.