The most impressive of Basel's three remaining city gates.

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

In a fusion of myth and mischief, this statue is a testament to this university's quest for both knowledge and pleasure

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

This historic streetcar system has been running since the 19th-century.

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

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.

A railway station takeout shop sells boxed meals in containers shaped like trains and snowmen that hold the country’s abundant regional delicacies.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

Over several decades, one of London’s most iconic city gates was dismantled, moved out of the city, and then moved back.

This building contains a door only used by members of the royal family.

This statue of one of the engineers who created the London Underground hides a ventilation shaft for the tube lines that run under the street.

A secluded green oasis amidst the towering skyscrapers, bears an unusual moniker that reflects one of the city's oldest guilds.

Near the site where the English Archbishop was born, you can find an emblem in the shape of a pilgrim's badge.

Ship-sized kinetic sculptural fantasy.

This hand-painted advertisement is a literal sign of encouragement, however unintentional.

The ground on which Shakespeare’s initial playhouse once stood.

The last remaining example of the boatmen's perches that once dotted the south bank of the Thames.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Wooden pavers represent a 17th-century barrier that gave Wall Street its name.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

If it hadn't been caught in time, a flaw in the design of this Manhattan skyscraper could have led to its collapse.

Fake subway tiles were installed to cover a design that resembled the Confederate flag—it's unclear if the resemblance was intentional.