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

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

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

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

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

This coffee shop lies hidden beneath a historic church.

This 47-story "M" needed 20 years to be completed

These fly sculptures are scattered around the city and represent the patron saint of Girona.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

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

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

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Mountain where Jesus was first tempted by the Devil.

A bronze sculpture of a monkey sits outside this factory, which has made an anise-flavored liqueur for over 150 years.

The unexpectedly beloved remnants of a controversial thermal power plant.

This semi-secret storybook hedge maze is also the oldest garden in the city.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

This Roman arena once played host to bloody gladiatorial battles.

Long tunnels run under the ancient chariot racing circuit to the tower.

Stunning Roman aqueduct used for 1900 years and still standing.