This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

Squeezing inside this deep, narrow canyon reveals a festival of desert colors.

Perched above the bustling town of Kerak is a sprawling, ruinous castle that has witnessed nearly a millennia of Levantine history.

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

A more chill but no less fascinating version of the famous ancient archeological site.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

A very classy 1920s-era bar right in Grand Central Station.

The "Seinfeld" diner.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

This snug medieval lane is one of the narrowest streets in the world.

The hidden lair of an alchemist rediscovered in a 2002 flood.

An allegorical statue of a giant pregnant woman representing justice and truth.

This sculpture forces visitors to confront their relationship with space.

A Reformation-era fiery figurehead once denoted this location as a print shop.

Secret Swing.

An abandoned 1970s theme park that has been turned into a space for waterfront walking.

A fantastic place to see murals, and an important location in the history of Toronto's legal street art scene.

In the back of a bustling factory lurks a quiet museum honoring the history of Canadian sugar manufacturing.

One of the largest underground systems runs under Canada's largest urban center.

This urban oasis is a marvelous meld of music and landscape architecture.