The design of the Palacio Salvo has been described as "a lighthouse on top of a building."

One person’s lost luggage is another person’s treasure.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

Amsterdam's former hotspot for public executions and dissections.

The remains of a chapel created for convenience.

The stunning interior of this Gothic church is covered in ornate gold details.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

A lush indoor jungle fills this bustling Madrid transportation hub.

This natural hill rose another 130 feet from the debris and rubble added after World War II.

This historic structure has been used as a mosque, a barracks, a prison, a school, and a bakery.

Legend says it was constructed with the destroyed pillar of an ancient Greek Temple.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

Large collection from the 3rd millennium BCE.

A tiny park in the middle of some big power politics.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

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

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

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

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

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

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