This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

Classic game cookery takes center stage at what's widely considered London's oldest restaurant.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

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

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

Skyscraper powered by wind turbines attached between its towers.

Fourteen sculptures showing the development of a fetus stand outside a hospital for women and children.

Home of the infamous Rug Man of Doha.

This unattributed sculpture in Amsterdam is hiding in plain sight.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

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

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A miniature city, once ruled by the Queen of the Netherlands.

Rumored to have been frequented by Vincent van Gogh, it's the only remaining genever producer in the Hague.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.

The largest 19th century panorama in the world still in-situ.

The building is a gigantic piece of art inspired by the shape of a desert rose.

This seemingly random 30-foot statue of an oryx in Qatar's capital was a mascot for the 2006 Asian Games.