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

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

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

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

A hidden three-foot-wide house separates these two regal churches.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

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

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A unique seaside cave where Aleister Crowley faked his own death.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This castle has links to Portugal’s founding and struggles for independence.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

Pop culture has helped to keep this iconic British building from being destroyed.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The Scottish Reformation leader's grave was paved over and is now a parking lot.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.