A quartet of brightly colored mythical beasts stand sentry at this gateway.

The most loyal of little dogs, or a Victorian era publicity stunt?

Protecting the dead from opportunistic body snatchers.

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

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

360° views of the city plus five floors of optical illusions and hands-on science.

An architectural oddity hides in plain sight on this iconic London bridge.

A tribute to all the green-thumbed workers who tend London’s public parks and gardens.

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

A jumble of concrete on the corner of one of London’s terraced buildings is actually a work of art.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

Soon after its unveiling, this giant inverted globe sparked controversy and was vandalized.

Once the tallest building in the world and the site of “the highest dinner ever held in New York” this building now holds the most expensive penthouse in the city.

An institution dedicated to the towering buildings that make up skylines in New York City and around the world.

On the Hudson resides one of the largest clocks in the world.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

A celebration of capitalism in Midtown.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

Amid skyscrapers and traffic exists this unique aquatic ecosystem.

A memorial to the first person killed by a motor vehicle in the Western Hemisphere.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.